Great solution however it will only remove the possibility of lower ranked bump bots in bumping the thread, for higher ranked bots or accounts intended for bumping (Sr. Members and above) this problem won't be good as the self-moderated thread can still delete their post after they bump it to avoid getting caught. Although you suggest that you can increase the prohibition to higher ranked members I'd say it is impossible because not showing the "last post" of Sr. Members or above is way too much for the forum to consider, a lot of members (especially the ones who are Sr. Members) who are not bots will be greatly affected. I do have another solution in mind.

Solution: On Self-moderated threads when the author deletes the post intended for bumping their bump to the first page will be voided and they will go back to the page where they last stayed.