Hi! Creater of Refined Hacker New here :).
You mentioned that the "toggle all comments" button is broken, could you elaborate a bit more on that, and if possible open a GitHub issue for it? Thanks a lot :D.
Apart from that, with RHN you can navigate through the comments using the "J" and "K" keyboard keys and Press "Enter" on the highlighted comment to toggle it. Hope that helps too, cheers :)