I think so too.
There are too many ATGMs around for Russian to use so much armor without clearing infantry. If Russia uses lots of infantry, the losses in lives are huge.
Urban warfare is impossible for the invader and invader that depends on armor. If we put USA in Russia's position, the outcome would be severe losses as well. To perform such a takeover of a well defended city full of ATGMs and snipers in their tens of thousands of troops if not more, the only real way to do it is paradigm shift weapons or strategy. Some suggest drones, robotic infantry with more advanced sensors to counter snipers and ATGMs but in this sort of warfare, no one has proven a way.