PENCO:
To bust minimums is bad enough, but to do it all the way to the deck, on a non-precision approach? What were they thinking?
Agree with all you said except I'll quibble on the NPA aspect. If it were an NPA, it would have an MDA rather than a DA.
As to the database, this entire effort was a fiasco, starting with Nepal's aviation authority. RNP AR approaches are in a separate category from all other database approach procedures. There are many additional hoops for both the state aviation authority and the operator to jump through as part of their RNP AR authorization. Neither Nepal nor THY management did much of that.