I have no problem with Trump calling the President of Taiwan. He acknowledged a reality Carter denied in 1979. Taiwan has functioned as an independent nation for nearly 70 years.
The mayor of Taoyuan ...
Since not many DU-folk are likely to know much about Taiwanese geography and this post might be seen by a DU-onlurker, Taoyuan is a large city that borders with the capital city, Taipei. The international airport that serves Taipei is located in Taoyuan. Taoyuan and Taipei both have a lot of companies with operations in those cities. All in all, it would make a great deal of sense for Trump's hotel business to have a hotel in Taoyuan, near the airport.
DU-folk are trying to advance the narrative that Trump is profiting from being President. Two problems:
1.) Trump isn't President yet;
2.) they have no evidence Trump spoke about building a hotel in Taoyuan with the President of Taiwan.