I don't believe that he bought his chart positions. Views is a streaming monster that gets over 100M streams per week and the Billboard 200 chart incorporates streaming so even if he bought his chart positions, he'd still be #1.
However, I do believe he's depressed. Didn't he say he stopped talking to Nicki? You can tell that Nicki brought a lot of joy into Drake's life and without Nicki, a good percentage of his joy is now gone (no shade).