In January 1941 the Soviets had over 23,000 tanks.
By December they had slightly less than 6,000.
The Germans completely annihilated the Soviets during Barbarossa and it would take awhile to recover.
True. And they had a LOT of crummy tanks, too, like the BT series, the T-26, and “land cruiser” T-35. But, in 1940, they already had the T-34, which would eventually take them to Berlin.