I'm considering taking this up semi-casually as a speed game. However, I have the Switch version. The rules for the runs seem to involve showing the contents of certain files on the computer to prove that the game is unmodded, but I don't know how that would apply to the Switch version.

Do the rules need modification, or is the Switch version simply disallowed?

Switch is fine. The stuff about mods only applies to PC because we need runners to show they aren't cheating by modding the game. There's no way to mod on Switch so obviously, you don't have prove you're using none.

Similarly, for timers, you obviously can't use the auto splitter to show loadless times (not that we even use it) but you should still use a real time timer of some sort if you can.