Russians could've easily lost as much even with better military hardware.
Most of Russian military hardware losses are not from battles, but from soldiers routing, and abandoning their vehicles, which are LATER destroyed, or captured.
Most Russian tanks were disabled by artillery, and missiles, not tank vs. tank battles. No tank in the world would survive a 40kg missile, or an artillery shell hitting its roof. So, the quality of hardware is irrelevant.
What is really low quality is the Russian military leadership.
The key here is to understand that losses do not come from 40kg missiles themselves, but from Russian generals knowingly sending their troops into ATGM, and artillery killboxes, and from Russian troops knowing their generals intentions, and acting accordingly (routing upon first battle damage)