I am skeptical about everything. However, I do believe that the performance of the Russian military last year in the Ukraine was on par with the 1941 Russians (not good) and they did lose a lot of their newest equipment and best units.
OTOH - I think many of us thought this long before these classified assessments were leaked.
How are you so confident in your assessment of Russian Federation military performance, given these leaks show the casualty ratio as 7:1 in favor of the Russians?
I decided early on not to believe either side as reported in media outlets...