Welp, it wasn't #Nvidia. After my brothers system became unbootable, #Linux kernel 6.13.0-1 appears to cause my #OpenSuse #Tumbleweed (AMD/AMD) to freeze during boot as well. Doesn't recognize my keyboard presses during password entry or new USB devices anymore, so the kernel seems to be royally dead.
Reverting to 6.12.xx fixed the issue.
Anyone else on Tumbleweed who experiences this? π€¨