I think the most likely thing is that when they got Stormzy's verse, apparently late in the process, they didn't wanna say "hey man you need to change this line or your verse won't make the song". After all, they realized he was huge and probably wanted his voice on the song.
Which I guess is selling out lol. Still though I mean..I didn't even think about it that way until you pointed it out. If it was Mike I would have been shocked. With Stormzy though I think they just figured that "featuring Stormzy" was worth allowing "hoe" in the song.
Personally I would rather have had 2 Mike verses, regardless of what Stormzy's lyrics were, but whatever.