I believe that Nepal doesn’t have reciprocity agreements that permit non Nepalese or Indian operators to work there. Hence the use of Indian hams.
The CEPT website shows that foreign hams can get licenses but must pay high fees based on the number of bands you want to work. It would seem reasonable the under emergency conditions that Nepal would allow volunteer ops to come in. Based on some traffic I heard earlier the net control station was calling for check-ins from any 9N stations. I don’t know if that means that other 9N stations are up and operating. I heard none.