The HIV protection from circ is at the very least questionable and quite likely completely false. The subsaharan studies have never been able to be replicated elsewhere and a place like the USA where most are cut high a higher prevalence of HIV. There's may something about the african HIV spread dynamics that could be true but not showing elsewhere.
On top of that, of that document you shared from the WHO, 53 pages of it talking about the amazing benefits of botching up your dick in the name of prevention, fails to mention a single study as proof for this strategy (I checked)... The WHO (and bill gates) are running with it. Not a WHO critic but in this case they are backing a strategy without sound data behind it.