I understand what he's saying, and there is a good point to it, and i am not trying to brag, but...
Europe has the real weapons, Russia has mostly 1960 weapons left. Europe has jets that will very quickly give Europe air superiority. It has a good 4 years to prepare, Russia has broken half its teeth on Ukraine. The only advantage that the Russian army has now that it has a log of soldiers with heavy combat experience, but Europe has the advantage that it has been seeing for 4 years how Russians do their job and so far that job had been abysmal. They can barely hold their own against Ukraine troops, how are they supposed to hold their own against much more military personnel with much better weapons?
Unless things change, and ignoring nukes, once you have air superiority, that's it, the other party is pretty much done for. Europe would not have to play by the rules that the Ukraine is playing by right now, they can and will take the fight to Russian territory.
A Russian invasion into the rest of Europe would be disastrous for Europe but it would be terminal for Russia. It would end either with Putin dead and Russia under control of Europe, or it would end with nukes which would automatically drag the entire world into WWIII after whcih we can all enjoy the fun again of living in the middle ages for the following hundred years or so.
This also ignores that, with the current abhorrent state of the Russian army as it is, they still gotta defend their own territory and they have half an actual super power sitting right next door that would also love to take bits and pieces of it. In the state they currently are, how are they going to do that, and then also take enough to defend Europe? Putin may be a dictator, but he too had to deal with popularity, and hoe populair you think he'll be once he needs to do two or three new draft rounds to get enough people to fight his wars?
I don't see a European invasion happening, it'd be the same mistake as Hitler invading Russia back then