The video poster reminds of one of the propaganda stages that the Russia freepers used for a while, that “Russia isn’t doing better because they haven’t sent their best troops yet”, I think it was later that those freepers switched to a similar, “Russia has only held on to the territory they are stuck in, because they planned it that way, it is all they wanted”.
Since the propaganda posts never switched to “now the best troops have arrived, look at the incredible results in the difference”, I think that at almost 5 years in, we can guess that the best troops were wiped out early in the war, just as was reported.
Old Russian saying: “Things are getting better! Yesterday was better than today, and today will be better than tomorrow...