The Start-Stop Thingie:
I installed it today. It came in a brown cardboard box, just the cable and a mini-plastic pry bar. The photo of it on AliExpress shows that pry bar going behind the button assembly on the dash... but reading about someone who did one on another Genesis, they mentioned there is a screw holding that switch in position. SO - I went in through the side.
On the end of the dash is a black plastic panel (grain sort of finish) - looks EXACTLY like the one Genny copied it from (Cayenne), and guess what - it comes out exactly like it does on my Porsches. First you pull the rubber weatherstripping away from the doorframe in the area of the panel, then you use a plastic pry bar to pull out the plastic panel. To keep from making a mess of the material on the dash, I used a microfiber towel as a buffer behind the pry levers (and yes - I used more than one. I got it started in one spot, and left the lever in place to keep it open, then worked another lever around the edge from that open space, and eventually it popped off undamaged.
Now you can't exactly see the connector you're going to remove, and there isn't enough room in the openings in the side panel to get a phone in there to take a decent picture (and what a PITA it is to use a cell phone camera blind where you can't see the on-screen button..) SO - you're mostly going to go by hand, and if your special tool drawer has an inspection mirror - that mirror (useful thing, about $4 at Harbor Freight - sometimes a door prize
Telescoping Mirror) You also can access that area from underneath by pulling the "Fuse" cover off the lower dash (there are no fuses back there that I can see...) and reaching up through there.
So first unplug the cable from the switch. Follow with your fingers and the top of the connector has a locking tab that you can just barely depress with your thumbnail while pulling on the wiring with your other fingers. It is the connector closest to the opening (I think it may also be the only connector going to that area..)
Using that mirror you can just about make out the receptacle that the new cable should plug into. This is VERY frustrating. You can't directly see the receptacle, you need to use the mirror to see it, then what I finally did was put my finger on the bottom edge of the opening and guided the new connector into it, until it clicked. This part of the project involved about 45 minutes of mild cursing and swearing, and regrets that I ever started the job.. and I couldn't see a screw holding that panel in place, but there might have been one -- I just couldn't see one.
I took some photos trying to see the connector - they're pretty much crap but I might upload one so you know I made the effort..
So - overall job:
- Disassembly - about 5 minutes
- Reassembly - give yourself an hour
Stuff needed:
- The cable (duh..)
https://www.aliexpress.us/item/3256806472707876.html
- Inspection mirror (see above)
- A variety of plastic pry bars
- Microfiber towel
It works. Turn the ignition on, notice the switch is not lit, after about 10 seconds it IS lighted meaning Stop/Start is disabled. If you want to reverse the scenario there was some nonsense on the website where you could reprogram it so it wasn't there, but I see absolutely no reason to do that.
DISCLAIMER: I take no responsibility for what you do to your car. I'm just telling people what I did to my car. You may be someone who shouldn't be within 30 feet of a sledgehammer. I might be a babbling baboon. Whatever you do - be a big boy and take responsibility for your own actions. I also take no responsibility for your becoming addicted to AliExpress, so much, so cheap, and the majority of it is crappola. There are some very funny and odd things for sale if you wander into the "adult" section of AliExpress. Things I've never seen before. But - not my fault if you buy them and they fail to meet your expectations - you've been forewarned.
What is on the AliExpress page:

I'd like to report "suspicious activity" - but to whom?
Can anyone make any sense out of the instructions?
I didn't follow their instructions since I hate replacing expensive plastic that I broke, and it's probably backordered forever from Korea (even though the vehicle was made in good old Alabama, USA.)
UPDATE - I left the vendor a message yesterday on AliExpress about installing it - I asked if they really meant to pry the switch out the front (which seems like it would be a whole lot easier), in response, they thanked their friend for asking, and sent the following illustration:

SO - if someone is feeling brave... (btw - the connectors are all white, no red to be seen..)