All true - but,as he mentioned,Putin do not care about those soldiers.And he do not mobilized russians,especially people from Moscov and Petersburg.
So,there could be hidden army of russian elites with all T.14 tanks waiting for right moment to attack.
As @Chiron would say,feint.
Considering that Moscov had long tradition of wsting their soldiers life in stupid ways,it is possible.
Althought - i do not belive in soviet super apemans hiding in underground cities for final attack.
Well,underground cities exist,but as places to hide for Putin,not hide his supersoldiers.