My Ioniq 5 does, but I don't think it'll natively support NACS until next year's model... That said using most Superchargers would be a step down in terms of charging speed, I think it would mostly be helpful in areas where there's low coverage for 350kW stations (edit: to be clarify, 350kW stations are the only ones I've seen that saturate the cars ability to charge. But it doesn't hit the full 350kW)
I think the max charge rate for an Ioniq 5 is actually more like 225kW. The bit about 350kW stations enabling the 15m 20->80 charging is because the next step down in an EA/Chargepoint station is 150kW. And in practice, mine rarely gets up anywhere near max charge rate, though that probably has more to do with EA's station quality than the car itself.
The bigger issue with Supercharger is the voltage, if it's not a 800V charger. The internal converter in the E-GMP platform for a 400V source ends up being a limiting factor and drags the system down to something like 75kW, similar to a Bolt.
Updated the comment to be a bit more clear. Funnily enough, I usually get better than 150kw on EA's 150kw chargers (I assume because being capable of 150kw at 400v actually means they can do even more at 800v?)
