A comment can be made obsolete, for instance, by the deletion of an earlier comment on the same post.
Under the assumption that a comment on a given post (question or answer) gets flagged as obsolete and that flag gets reviewed by a moderator, I can imagine how the moderator could be unsure as to what to do (delete the comment or reject the flag) if s/he not have access to the whole history of comments on that post.
Hence my question: do moderators have access to deleted comments?