They thought they were still tough. We can make our own assessments, and we can hack or bribe their officials to get their take -- but if they think they're hot shit, what are we to expect?
And it's clear that they did indeed think they were hot shit: their planning, and eventual failures, reflected that.
If the Russian Army itself didn't think it had a problem, why would foreign intelligence?
Also, the Red Army's logistical skills are not de facto inherited from the civilian population's. Significant hand-over and training would be needed.
Still, yeah, a lot better than the kleptocracy of Russia. Man, they still don't have forklifts. How the hell did we think they were anything?