It's like you're so close to getting it. Xi is serious about "corruption" alright. It's just that in an authoritarian state "corruption" is really just used as a euphemism for illoyality.
If having corruption as an euphemism for "illoyality" means we get the same kind of public investment in infrastructure in the west as China does, then I'm all for it. Seems like here we only have the corruption part, except they call it lobbying and rub it in our faces.
But there is also tons of actual corruption especially in the military [1] which is maybe by design so you never know if a purge is political or legitimate or both.