Huh? I didn't say, nor imply, that the crime would be any less heinous if the alleged victim was 14 and not preteen; I was just correcting your mistake.
He didn't need to state it or provide more sources, as all this was in the wikipedia page he linked you:
The rape allegation has never been substantiated. No evidence has been found to support the rumour nor has any victim come forward (further rumours asserted that this was because the victim was present in Britain unlawfully and feared deportation).
Despite the appeal, forensic searches and questioning of several individuals, the allegations have never been substantiated and no witnesses have come forward.
On 21 February 2006 the Press Complaints Commission censured The Voice, the leading Black newspaper in Britain, for reporting the alleged rape in terms that suggested it was unchallenged fact (the newspaper had headlined "Gang of 19 rape teen").[14] The rumours were picked up by two Caribbean websites Blacknet and Supertrax which each allowed their chatrooms to post reactions from around the country. Supertrax reported that Lozells was swarming with "Paki gangs" with "sumtin to prove"; whilst Blacknet, a website promoted by The British Council, printed various contributions one of which was: "I hope Asian women are getting their throats cut as we speak", followed by a response: "Narrow it down to Pakistani women and I'll agree with you". After the riot, Blacknet apologised and removed what it called "absolutely disgusting" material posted on its site.[15][16]
The animosity that preceded the rioting appears to have been largely based on local economic rivalry combined with possible agitation from opposing criminal gangs.[1]
The problems specific to the Lozells area appear to be centered on the prevalence of Asian-owned businesses, the "unfair treatment" and "derogatory attitudes" of each community to the other.
Why would he specify having an issue with a rumour of a crime that the wiki he linked said there was no evidence for? It seemed pretty obvious to me that he was applauding the Pakistani community for fighting back (unlike, say, Asians in Ferguson), not cheering on gang rape of black teenagers.