No, not nonsense at all. As per police reports "the overwhelming majority of child sexual exploitation is by English men".
The proportion involved in grooming is higher for Pakistanis than proportionate to their population yes. However that doesn't excuse that this is also a horrific and endemic problem for English males also.
Even the last source you posted supports this but with a misleading heading.
"According to the most recent figures, released in 2012 by the National Crime Agency's Child Exploitation and Online Protection Command (CEOP), 100% of child sex offenders in p-aedophile rings were white."
The report says CEOP, an official government body, identifies two types of group-based child sexual exploitation offenders.
Type 1 offenders were those that targeted their victims based on their vulnerability (roughly equivalent of grooming gangs), whereas Type 2 offenders target children as a result of a specific sexual interest in children (roughly equivalent of p-aedophile rings).
CEOP found that 75% of Type 1 offenders were of Asian ethnicity, whereas 100% of Type 2 offenders were white."