Yup. I've stared at that for a long time on several occasions.
Notice however that virtually all of the decline takes place on the inward journey, when it was still summer. The reality is most of the losses came from desertion caused by inability to supply so large a force. He could not move rations from his stockpiles to the army efficiently, because it was advancing rapidly and his supply of horses was quite limited. They died first. Men trying to live off the land found it practically uninhabited compared to what they were used to in western Europe, and strayed far from the main body looking for food. Often as not, they found cossacks instead.