The problem with the pro-Blue polls like TVBS (100% owned by Hong Kong Chinese) is not that they are right or wrong in hindsight, it is that they cannot be trusted beforehand because they are pro-Blue and consistently underestimate Green votes. You only have to scan the list and look at the Green column for TVBS poll results and actual results. In almost every case, the poll underestimates the Green vote by 25-50%, sometimes even more.