IDK how the ban system works exactly, so I'll agree with it probably being a mass report.
Could it be because you just destroyed someone 6 times and they and their friends mass reported? Sure.
Though if they're new to battlefield they may have mistaken the netcode issues with you cheating. If they thought they were behind cover but yet you killed them from the otherside of the wall. ¯\_(ツ)_/¯
The ban is still stupid and shouldn't have happened but I'm gonna take a wild guess that it wasn't because of your 2.0 K/D and instead of other b.s.
