I can confirm that.
I crossed the Pakistan border from China via Sost some days ago and drove the KKH southbound. Medina GH is open, with many guests. Mainly bicycle riders. It was a beautiful ride. No problems at all.
The visa on arrival in Sost is also no problem. Make sure, that the customes in Sost put their number in the carnet de passage. I had problems to leave Pakistan without this entry number.
I had to cross the Hunza lake with boat. People were very helpfull.
motorbike on the ferry