The run I submitted is technically a 100% run because I beat all three tiers of objectives in all 18 scenarios of the base game, but what does any% mean? The only real way to beat the game in my eyes is to beat all the scenarios so it just seems redundant. Unless there's something I'm missing.

You can actually try and do the first tiers in all scenarios without doing the last two scenarios (They unlock if you complete all three tiers on all scenarios)

So the any% run is just beating Apprentice on the first 16 levels and stopping there?

Also, sent a friend request on Discord, wanted to discuss rules and categories

Exactly. Accepted the friend request.