Can I delete PowerPC Application: /Library/Application Support/AuthApp ...

... , and also /Library/Application Support/ApplicationPerms ?
Both date from 2002 .

Assuming you have no PPC apps left (some will run under Rosetta), then I don't see why not.
If you want to play safe, move the items to the desktop for a while and check that nothing throws a wobbly before consigning them to the trash.

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