That is the opinion of a military instructor who teaches the cannon fodder how to fight. He doesn't share the view of the Internet warriors like you who would say that Russia wouldn't stand a month or three weeks (like Hitler thought) against the true warriors of western civilization. The actual problem is not that the guys of your level have such a viewpoint. The problem is that the US leadership's level is exactly like yours.
Nope, the problem is people such as yourself believing what nonsense is fed you, or that you pass on from your handlers. I was also an instructor and combat soldier in the US Army, and I can assure you that your boys will be hard pressed to do anything other than surrender. Rattle your swords of war all you want, but step over the line and Russia will pay the price of Putin's aggression.