I am pretty sure TianoCore is also used by AMD systems as a reference as well.

Here’s a similar situation that happened in 2019 at Lenovo’s site

support.lenovo.com/cl/es/solutions/LEN-22660

AMD systems are listed as well.

As for most board vendors nowadays, I think they barely do anything with the code itself and just create the setup utility and boot logos. It is highly likely that they’re affected too.