Comment flags can only be acted upon (resulting in the deletion of the comment) or declined, there is no option to provide feedback (which is actually optional also for flags on post).
I didn't handle the flags on these comments, but I would have declined them as well. The comments show good community actions on helping a new user to understand the site ...
In general comments are considered to be temporary information which can (and sometimes will) get deleted once the objective/purposed of it is reached.
The purpose of comments as such is documented in the Help Center:
You should submit a comment if you want to:
Request clarification from the author;
Leave constructive criticism that guides the author in ...
It seems flags can not re-flagged, given this check
You have already raised this type of flag and can no longer reraise it
So users who accidentally "dismiss" flags should be deleting the comments when flagging was legitimate.