“That is a fact because he lost the momentum to invade.”
Define ‘momentum’. If he never intended to invade then your statement is just silly.
Momentum is not giving the other side, that is NATO and Ukraine to build up an escalated response by putting them in front of an accomplished fact of a single invasion across the Southeast. Now, NATO had time to articulate its response and it was firm. Ukrainian government looks less and less as incompetent fools. Therefore if Putin still invades, the Russian people will blame him for the consequence. And indeed — they are withdrawing today.
We know that he intended to invade because the military commentary was that the troop formation was for offense and included medical personnel. We also know that without a land bridge to Crimea the whole thing becomes a logistical nightmare for RF (Crimea imports 2/3 of its energy needs).