The citizenship issue is correct. As noted in this thread, the path to Taiwan citizenship without renunciation is now quite clear for Plum Blossom Card holders. The rationale seems to be that these folks have already been “vetted” by professionals, so they don’t need to be vetted again for the citizenship step.
But the 183 days part mentioned here by owleyes is news to me. I have not heard about any definite changes affecting Plum Blossom Card holders on this matter.
Guy