Well, his argument really only means anything if you agree with his definition of “Far left” to begin with. If you do, then he is explaining that all of the above mentioned things are outside the parameters of halacha and have no basis in Rishonim or Achronim (as opposed to the beracha change) and therefore SHOULD have been spoken out against by the “far left” authorities who assumedly disagree with those events/actions. Since they have not, their silence have given people the impression that the “far left” indeed does agree with those practices, which he contends they do not. Thus, those are the boundaries that need to be drawn to clearly represent what the far left really does believe in.
In reality though, the definition of “far left” has no real nafka minas, because either you subscribe to their hashkafa and rulings or not, regardless of what you label them. They both agree once you are out of halacha, you’re done, and not given any authority or the opportunity to have your opinion entertained. They both agree (I think?) that those who raise valid points, within the contexts of halacha, that would contribute improvements to society at large, are still in our camp. So yea, no nafka minas as I see it.
Poppa, hope this helps. And if it didn’t – sorry, I really wrote this off the cuff; its been a while since I read the first article and just don’t have the time to redo it.