Weird to focus on Augustus being fat when the whole Oompa Loompa origins is more, problematic.
That being said who cares. Shouldn't need to change but changing it barely alters your view of the book. Kid got bounced cause he ate a crap ton of chocolate to get there and then sucked up a pipe in a chocolate river, being obese was a by-product of the gluttony but all Dahl cared about was creating a character who got where he was cause he was gluttonous.