As to the comments, here's what happened. First the question-asker deleted the all but one of their comments. Then your four comments were flagged by someone (I can only guess who). Two of these comments were direct replies to now deleted comments, and made little sense without that context, so I deleted them. Two other comments of yours still made sense and were kept. (A couple other comments that made little sense in the absence of the question-askers self-deleted comments were also removed at this time.)
I should add that moderators cannot undelete comments that were deleted by their owners, and so when tidying up after one user has deleted all their comments, our options are limited.
As for the moving target: don't
waste spend more time or energy on this than you're willing to. As one of your remaining comments mentions, the question appears to be more of a challenge than an actual real question. I think Thursday's suggestion is apt in this case.
How common are these situations? Moderators delete comments that serve no (further) purpose on a fairly regular basis. In the last 30 days well more than 1000 comments have been removed by the moderators. Users making 39 revisions to their questions is much more rare, and the moderator team is watching this user.