Russia is on a war footing. That was not the case before the war. And yes, there’s a labor shortage. 1,000,000 Russian men are in the army now.
1. "In the army" does not mean what it does here, due to the incredible lack of mechanization in Russia. For every trigger-puller, Russia needs huge numbers of men to carry artillery, ammunition, water, food, etc to the front.
2. Don't forget the hundreds of thousands who are already dead!