I never saw it anywhere near that price. I bought it with a 15% discount last November at it was about $160.
Yes, that is the Tom Molougney that I mentioned, I used his 15% discount coupon (now expired).
The potential problem would only occur if you used that adapter with a 400v car, which could cause higher amperage to be drawn. The GV60 (and all the other EGMP vehicles) is limited to 97kW, which is about 243 amps. That's way below the Hyundai OEM adapter's 350 amp limit. But suppose you have a 400v car that can pull 180kw from the charger - that would be 450 amps, way over the limit of the Hyundai/Kia (and presumably Genesis) adapter that has been reported. In other words, the Hyundai adapter is designed only for Hyundai cars, and Molougney is concerned that some of these adapters will wind up changing hands and being used with other, non Hyundai vehicles. After all, the plug will physically fit these other cars. All of the other adapters - Tesla, Lectron, A2Z etc. have a 500 amp limit. It's hard to believe Hyundai is saving much money by limiting it to 350 amps, so this does seem like an unfortunate design decision on Hyundai's part.
FWIW, the two times I used the A2Z adapter it remained cool to the touch the whole time. I have seen videos by Patrick Anderson (Mach-E Vlog) where the free adapter he got from Ford got too hot to touch - he resorted to carrying a towel so he could safely remove the adapter. So I'm not sure I'm convinced that OEM necessarily means better.
That's the first I've heard of TeslaTap producing a DCFS adapter. It certainly looks well made in the pictures, for whatever that's worth. I think they have a reputation for their AC adapter of being very well made but expensive. I hope you'll report back on your experience with the TeslaTap.