Well, that's just the bitter (for you) truth.
It's somewhat amusing to me the efforts members here go to try and craft strategies for an utterly lost position. The only strategy Taiwanese soldiers have is to tie their undershirts to sticks and wave them.
This is the thing. Taiwan, sorry. I shouldn't give it the pleasure to acknowledge that there is such a country. I shall call it it's official title. Republic of China (ROC). They really are a worse place, and it'll get worse daily.
No country, with the exception if US, is willing to stick it's neck out (like before) to upset their relationship with their official China with whom they have fruitful and profitable relationship with. And with each passing day, their options are getting more limited. The only play they have left is acquired military assets that only delay China's advances enough for the US to come to their aids.
Which is probably why they done for these "expendive" subs. But even this strategic choice will close off to them one day.