This is quasi-intellectual bullshit written by a contrarian who fails to identify that social systems are dynamic, and evidently has a bias informing this (cough cough, certain pejorative terms throughout). This is spun as some sort of centrist triumph, but this is really the true voice of regression - if we stop advocating for the rights of groups who actively have their rights under attack by others, they will simply lose whatever has been achieved.
It is a somewhat interesting point w.r.t. the Dimes syndrome itself in whatever limited cases it might actually apply, however I would argue that this article is working overtime to misappropriate the term to advocate for silencing progress (while not ever implying that anti-rights groups should be seen the same).