It's genuine.
The leaflets reference issues in the area - and so, the assumption is those who have the leaflet on their seat aren't necessarily the actual deviant.
I also assume if the club were confident on the offender, they'd warn them direct.
As is, the approach means those with the stickers are inevitably going to be tarnished by it directly, even if the issue is described to as the area.
If I was on the official fans forum, I'd be suggesting the club use their CRM to contact fans in those "areas" they refer to, rather than the name and shame vibe to it.
I get the club will need to react to complaints etc, but I'm not convinced that execution is the best.