cedars >> Just looking at your research.
As you pointed out, the place referred to as "Tahan" is actually Kalewa.
Just looking at the makeup of Kalewa Township it says:
Religion: 99% of the inhabitants of Tahan are Christian even though Burma is a Budhhist country and 90% of population are Buddhist. Only 4% of the Burmese population are Christian. There are over 50 churches in Tahan. This is the only place in Burma that a church can be seen from every street corner and where Christmas is celebrated.
Once more we can detect a WTBTS focusing on proselytizing Christians to their JW belief system.
True missionaries most likely will preach to pagans / heathens.