Travel from Kathmandu via Kunming destination Vancouver, Canada

Hello,
Many thanks for this forum. I am Canadian and my husband Nepali (he has multiple entry visa for our final destination Canada).
Just to confirm: We will have less then 24hrs transit in Kunming before our onward flight to Canada.
From what I have read: BOTH our countries are accepted for the 24hr direct transit?
If we exceed the 24hr and would like to use the 72hr free transit - does this apply to Nepalese?
Many thanks