User blog comment:DaNASCAT/Technical Update: August 22, 2016/@comment-4129195-20160823213017/@comment-1824272-20160824000852

Definitely adding my support for removing the "reported" flag for comments on deleted posts. I'm surprised to hear that's not already the case.

@BertH: I don't know about Energy X, but I would personally expect the "reported" flag to remain on reported replies if the base post was then un-deleted.