I am seeing those on my FW13 AMD as well, but only in Linux 6.9 and newer. 6,8.9 and earlier boot without the errors.
I am on NixOS, so this isn’t Arch-specific. Seems to have something to do with the more recent kernel versions.
The rest of my config: BIOS 3.05; 2 USB-C cards in slots 1 and 3; 2 USB-A cards in slots 2 and 4. Nothing is plugged in any of the ports.
Removing the USB-A cards gets rid of the messages.