I don't think he does 400k doe... even if he's projected to have the biggest streaming week. 400M US streams, even if thats massive, that's just 290k units. I don't know what he's doing in pure sales but seeing as he doesn't have any bundles or fan packs in store, I don't expect him to do more than 20-30k in digital sales. Best case, he ends up doing 350k off the album, from my calculations.
You can't do more without physicals, bundles and co, which is something every artist is doing right now to boost sales.
300k would still be massive in this scenario.
Crazy numbers regardless
I can see it doin another 150k+ next week