Where does the computer branding in KDE settings come from?

The settings on KDE show this info about my computer after buying a used motherboard. Apparently it came from a prebuilt, though it is a standard ASUS board. Where does this branding come from and is it possible to remove it?

The branding also shows in inxi:

Machine: Type: Desktop System: PC Specialist product: Tornado R7S v: N/A serial: <superuser required> Mobo: ASUSTeK model: PRIME B450-PLUS v: Rev X.0x serial: <superuser required> part-nu: 1744753 UEFI: American Megatrends v: 4402 date: 12/13/2023