The article doesn't explicitly say that it works with AMD/Intel cards, but it does seem to imply such.
It says that everyone can take advantage of this, but ONLY Nvidia RTX cards can do so. You have to be able to enable DLSS first, before you can enable the FSR3.0 frame generation component.
This allows RTX 2000/3000 cards to use frame generation even though DLSS3 isn't allowed by Nvidia on the cards.