2025 Ioniq 5s have the NACS port (only in NA markets, obviously). I don't think the 2025 Ioniq 6s do, though they probably will for the next model year. Like you said, CCS-equipped cars can use the Tesla network with a NACS-to-CCS adapter.

The article is about Europe, which has standardised on CCS2 charging. Including since 2018, Tesla. None come with NACS.

So European Teslas and Hyundai's have used the same plug since then. AFAIK, many UK and EU Tesla superchargers are open to other cars. ( https://www.carwow.co.uk/editorial/going-electric/ev-chargin... )

They say that the NACs adapter will be free to existing customers, but have not made any details aside from "2025" available yet.