I cannot understand Sokolvs line of thought, I have to admit.
First - yes the Russians intelligence knew very well about the French troops - about their location, their build up, their officers etc. from 1810 onward.
See the Czalas Translations form the Russian general staff.
The Russians learned from their defeats from 1805 zo 1807 and since then analysed the warfare of Napoleon - if in case they would encounter again, they would have better chances to win.
Also at what place, unless their borders the Russians should concentrate their armies? Certainly not in Siberia. For me to suggest that this was even more preemtive than Napoléon is a sad joke of history.
There was a huge French force in Germany which stayed there and did not withdraw behind the Rhine.
So Alexandre was prepared - but he did not cross the Niemen - nor the Vistula nor the Oder, it was Napoléon who unleashed his forces fully and without other reason than to bring the Russian Tsar onto his knees, for more -
Bernard Coppens book about the 1812 campaign.
Now - should I buy or shouldn't I buy the book by Sokolov, seemingly his deductions are were much coloured.
" only 72.500 french and german allies were present in whole Germany"
Bavaria, Württemberg, Saxony, Baden, Westpahlia, (to name only the bigger states) Duchy of Warsaw plus the French under Davout - certainly much more than 72.500 French and French Allies