Reading more carefully that post and checking into the sim, as mentioned in above posts, it is not that the airport itself is 100% missing, you can look for the ICAO code and start at this airport, what is missing are the paved runway and aprons. Meantime devs correct it into the base sim, as mentioned by AlphaRecon219 a free flightsim.to mod can be used:
WAVV - Wamena Airport for Microsoft Flight Simulator | MSFS