It's your definition that is misunderstood, not the oxymoron.
> Shadow banning, also called stealth banning, hellbanning, ghost banning or comment ghosting, is the practice of blocking or partially blocking a user or the user's content from some areas of an online community in such a way that the ban is not readily apparent to the user
> Shadow banning, also called stealth banning, hellbanning, ghost banning or comment ghosting, is the practice of blocking or partially blocking a user or the user's content from some areas of an online community in such a way that the ban is not readily apparent to the user
https://en.wikipedia.org/wiki/Shadow_banning