It's not true, he comes a few minutes online every 2 or 3 days and randomly handle the reports.
As you said, he random handle reports. Nice job, all my report have been approved but NONE have been delete.
I see lots of your reports still in the cue. Only one has seemingly been handled recently and the rest haven't so they have yet to be approved.
But the guy comes but doesn't do anything, I guess it's just his way to say "hello". We were even suspecting him to click the "good report" without doing anything, just to make people thinking he is doing something
When you report a post it gets added to your report count but that doesn't mean it has been handled. It's likely that the reports just haven't been handled yet. I can only see two of your French reports have been handled recently but lots of your English ones have so maybe that's where you're getting confused.