> ...But then again, shouldn't the Null symbol ␀ redirect to the page on the Null symbol, which it actually is, not the page on the Null character, which it only symbolizes?

Perhaps it should. That page actually did not exist when the redirect was created:

https://en.wikipedia.org/w/index.php?title=␀&action=history

https://en.wikipedia.org/w/index.php?title=Null_symbol&actio...