heres the way you can do it.

You don't set up a bot to delete comments, you change the.masses account auth.

make it

the.masses posting key weight 1
timcliff weight 1
threshold 2.

Then you write a bot for tim to co-sign all OPs automatically, but just ignore the comments. you won't have to delete them theyll just never appear

edit:

or

the masses public posting key weight 1
the masses secret posting key weight 1
threshold 2

Tim would obv run a bot to cosign OPs with the secret posting key, but he could also give it out to other anonymity minded indivuduals to divest himself of veto power.

This also solves the potential problem (not encountered yet afaik) of the.masses self editing posts if someone doesnt like whats posted. Since the bot could ignore edits as well.