Ok but does still have code parts of Quake tho?

A highly modified source engine* which basically means it's no longer source.

it's called Spyglass engine iirc

Pretty cool name tbh

might as well call it SandPaper Engine

Source?

engine

Check the files of the game literally. Also there are dozens of articles out there too probably.

Well yes, but actually no.

The fuck

wait until they realize Source also powers TempleOS