I anticipate that one way users will try to circumvent this is by editing the posts now instead: rather than deleting posts themselves, the bots can edit the posts to contain reportable garbage (i.e. single letter, whitespace characters, etc.) and have some other account report the posts.

Provided that a moderator looks at it within 24-hours (someone would probably test to see the staff activity of the section) this allows for deletion (albeit much slower than before).

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This does give us some more to work with if we consider the report and post history of Newbies (if those are the accounts they're using) since you could potentially nuke them as well but it seems like it would be a lot of work.

Implementing the captcha might not work if someone simply uses a captcha-solver.