The source is Military Watch Magazine, its not exactly reputable.
Now we know there are US personnel, but the number of missiles in Taiwan that can reliably strike the mainland are somewhere between 0 and "come on now". The HF-2 shown is a subsonic cruise missile which would pose a minimal threat to a 054A with datalinks, let alone anything newer.
The De-sinoization by DPP is weak at best. It is a fake identity. Look at the Gymboss, he wore one of those "I AM TAIWANESE, NOT CHINESE" Shirts a few years ago and was a DPP fave at rallies. Now he is livestreaming from the mainland and saying he is proud to be Chinese. Similarly the journalist Angelica Oung (born in Taipei, grew up in the US, went back after school) used to write for DPP aligned Taipei Times and now thinks the DPP are retarded. It is really hard to say "I am NOT CHINESE" then look around the "country" and see all the signs in some language that is definitely not Chinese.