My friends and business associates in Krakow tell me there's plenty of young men among the "refugees" they see everywhere. They complain that many drive nice cars and have bid up housing prices in their area. It would make sense that those with money and connections were the first to leave. They weren't fools - they knew from the beginning they would be drafted.
So NO, I do not believe for a second that millions of able-bodied men did not flee Ukraine in Feb. 2022.
I think you are right, we just can’t put numbers to it.