Can you shed some light on this?

Hej. I think it's ordinary vandalism. Of course, there was no consensus

OK, thank you for the feedback.

Basically, that guy is one of the crowd that was behind spam via wikimail some time ago, as well as other acts of disruption such as this one. Just a few trolls batshit insane about themselves being banned for trolling, and taking this as a justification for more trolling. There's no complex triage to perform - just shoot on sight.