I don't think anyone is even alluding to the fact that they should report 'le evil Asians'.
I think it's a case of people, and it's a lot, across the whole political spectrum, can see an obvious blind spot with there investigative journalism, they may pay lip service to a common factor across cases such as Rotherham and try, rightly IMO, point out that other common factors are at play, but because of the identity politics game they have championed they then without any sense of irony, ridicule, show utter contempt for, or run peices that appeal to their readership which exasperates an issue.
Although they didn't ignore Rotherham, they did run many op-ed's before that basically boiled down to 'islamophobia' to suggest such a thing (same with tower hamlets corruption scandal), and with cologn they did report it, but the delay in there reporting (not the only one I admit) hence the shit show that was all the below the line comments over New Years, but that the early edits kept certain demographics out of the frame, some of the early CIF articles, I think one by Deborah Orr was just a complete victim blaming masterpiece that turned many long time guardian reader of as the mask had been lifted.
As I said before, for me the hypocrisy of the guardian runs a lot deeper than identity politics, however, I think they have got themselves into a situation where they are worried of accepting that there maybe some flaws in the ideology they have so fervently pushed for a few years, or even worse, and this holds true for many of the most ardent guardian fans, that they may say something that people on 'the right' may agree with, or acknowledge that those on the right have some valid points.