Shadowbanning is an effective technique, so it can be intentional.

IMO shadowbanning is a highly unethical practice, especially but not exclusively for the fact that there will be false positives.

There will always be false positives because even if reviewed or decided by group or committee, human judgement is always flawed and none of us really know if a ban is appropriate or justified. (And even if it is, there is always a concept of remorse or forgiveness that should be a thing too.)

Just think of your own personal experience. How many times have you been wrong when being judgemental about other people? How many times have they been wrong about you? Most of the time that's just a mild social thing and it has no consequence, but practices like shadow banning make it consequential.

Shadowbanning people who have a wide reach on other platforms doesn’t usually work all that well, as this instance shows.