Well it already deserves LQ for the obvious reason the blacks are so dusty.
If you want me to add a section about scripting and denoising and what not I could, but I don't see the reason, since eventually it all comes to down to cleaning.
If the lineart gets fucked up then a Edited Manga can be an MQ at most --->
HQ guidelines said:
Redrawing done whenever needed (for removing japanese text or fixing crappy lineart).
In case of a completely ruined lineart where the art actually looks different from original, even if it's just for a single page, the entire Edited Manga deserves LQ, of course.