While what you say is perfectly true, I think the issue here is a) with proportionality and b) the fact that mostly white, all non-muslim girls were specifically targeted, so there is definitely a racial/racist element. These men were not raping teens who were the Muslim daughters of their friends and neighbours, were they? These girls were seen as lesser beings and fair game to be abused, purely because they were not 'good' or 'modest' muslim girls. c) The huge problem of ingrained and endemic misogyny and the sense of entitlement and justification to treat these children and very young vulnerable women as worthless sex objects, largely because of the shared cultural attitudes of the perpetrators, which is that girls who are not 'modest' enough have only themselves to blame. And that is an attitude which is sadly shared among many Muslims who, though they themselves would never do or condone such a thing, at the same time they seem to struggle with condemning it. They'd rather put their energies into deflecting and pointing elsewhere and complaining it's an Islamophobia thing. They are wising up to what can be said publicly on forums without there being a backlash, but privately the 'flies will land on an unwrapped sweet' type conversations do happen, including among many young Muslim women, as justification for why they cover.
With other men who might groom and exploit children for sex, the perpetrators have little or anything in common other than a sexual interest in children or adolescents. With these Muslim rape gangs it was a much more a collective and orchestrated act borne out of a total lack of care or respect for girls who were not from their culture or religion.
I'm sure if you analysed other grooming and exploitation cases you'd find the same problem prevalent in other minority ethnic groups too, no doubt also disproportionately represented in relation to the size of those communities in the UK. They may be Muslim, but they may not be. They could be Roma gypsy for example. But I imagine it would come down to the same thing, which is engrained cultural attitudes around women and girls.
I remember someone on the Muslim board complaining that the number of Muslim Pakistani men found guilty of rape or sexual abuse was very small compared to the the number of white men in the UK, which well may be true, but it completely ignores the issue or proportionality and the over-representation in sex base crime or gender based violence among men from certain cultural and religious demographics.