This is the first time I'm building a computer. I want it to support Thunderbolt 4 while using an AMD processor. I could use a motherboard with it inbuilt like the ASUS ProArt X670E-Creator WIFI, but reviews mention having issues with it so I'm thinking of avoiding it. So instead, I found a few add-in cards that support TBT4 (one by ASUS, ASRock and Gigabyte each).

The documentation for the ASUS ThunderboltEX 4, for example, lists various AMD X670-compatible motherboards, of which ROG STRIX X670E-F GAMING WIFI is one. So great, this mobo with this AIC should work, right?

But then I read "only ASUS Intel 500 series and later motherboards with a 14-1 pin Thunderbolt header can support ThunderboltEX 4 card", which suggests to me only Intel chipsets will work, despite AMD boards being listed on the compatibility list. I see very similar wording with the ASRock AIC as well.

So, why would AMD Boards (like for X670E) be listed as compatible when only Intel boards (500-series) would work? Am I misunderstanding something here?