Making a Youtube video private is equivalent to 'removing them'... it is no longer shared with, or accessible by the public.
It happens all the time for other kinds of videos: e.g. music videos, movies.
The only way that some video may be removed by Youtube is when it has been flagged for copyright infringement or offensive material which breaches
Youtube's TOS.
Once again, the PAP dogs in here had better check the facts before spouting rubbish during weekday office hours as part of their IB employment's job scope.