I created AutoModerator and was an admin for 4 years. I understand the differences intimately, but they're very similar from the affected user's perspective.

Does Tildes enable admins/mods to use either shadow banning or shadow removal?

No - I'm the only one that can remove posts at this point, and it puts a brightly-colored bold "This comment has been removed and is not visible to other users".

Wow I had no idea. That makes Tildes much more appealing.