Currently, comments and comment threads in InlineComments are deleted by pressing a button called "Mark resolved"; this wording is also used in the edit summary. I think this wording, although somewhat standard, is misleading in this case, because nothing is marked: it's a simple deletion. Of course, there's a record of it in the page history, and it can be undone, but that's true of any deletion in MediaWiki.

I think it would be better to rename this operation to "Delete", "Remove", "Close", or something along those lines.