Mentioning a MR adds the author of that comment to the "Commented by" section in MR approvers
Summary
@samdbeckham
mentioned !80648 (merged) in another commit, leading to him being added to the Commented by
column in the approvers overview of that merge request.
This was the only interaction he had with that MR, no actual comments were written by him, so he shouldn't be added to this section.