Of course doing things this way doesn’t necessarily prevent the person from possibly seeing it through the natural course of events, others notifying them directly (snitch-tagging), or even the use of things like refbacks, which would send them notifications anyway. And then there’s Voldemorting…
📑 Blind Person-Tagging | Kicks Condor
I thought about this case in the not-so-recent-past and came up with the possibility of creating a “submention” similar to the idea of a subtweet. If you scroll down on that particular post, you’ll see a response from Colin Walker about actually implementing it, which he implemented as a nomention plugin for WordPress.