I dont know, ask them. Something happened at my 10 year old son's school that prompted me into removing him and home schooling him myself. It took quite some time to extract what had happened from him, he was afraid of telling me for some reason. And while it was no where near as bad as what happened to these boys, I can understand their reticence.
I too was once a 10 year old boy, and honestly can't remember things that well, but I can't use that to make assumptions about how some incidents might affect others.
There is a reason these predators don't victimize everybody, they choose their victims carefully.
One thing I can remember about being a 10 yr old boy (I’m 52 now) is that sometimes I did not tell my parents about being bullied etc. (nothing like sexual abuse ofc, I had nothing like this happen to me)... but I had a vague sense of shame at my weakness plus a sense that things might go even worse with bullies if I complained to anyone etc., and a general sense that nothing could really be done for me etc. Lots of kids may have some combo of shame/fear/uncertainty and not know what to do. God they’re only kids.....
So while I know nothing specific about any such cases I do know what it’s like to be a scared 10 yr old boy not ‘telling’ anyone, even though I sure as hell wanted the bullying to stop (I was one of the 2-3 smallest kids in my class for a few years, and so easy prey until I got bigger).