I think it could go either way. The camera angle is odd but it's three warriors with their backs to the camera facing a Ratholos.
Are we absolutely sure this picture couldn't be replicated without development tools?
Remember how in Clouds gameplay trailer they had him laying down in that Pokemon stage that looked church-ish with Zelda kneeling down with a flower in her hand, having him dizzy on the boat, making Ike wear black to resemble Sephiroth?
Sakurai and his team are capable of being as accurate as they can with references to series so it is strange to me that what's meant to be a reference to a monster hunter cover, has characters standing in the wrong environment, characters not completely portraying the accurate weapon types on the box, and with an angle that they have clearly had no trouble manipulating for screenshots in the past.
Also not sure how many pages back, but someone did try to recreate the screenshot as best as they could and there's a side by side comparison for reference. It makes it a bit more clear that the characters have been adjusted in a specific way. Unless Ultimate has new camera mechanics.
Edit: Well a bit slow on the screenshot comparison mention lol