If it's a step down from 100k, it's progress! Also, the numbers have been decreasing for a long time already, else Bhutan couldn't conclude that they are done.
I agree. Their numbers are either so low that it counts as "done", or they actually didn't encounter any for a certain amount of time. They must either continuously sterilize the small trickle of remaining strays or plan a follow-up campaign. Implementing low-cost tree registration of pets should also help.
Sterilization alone doesn't work.