If a nobody disagrees with, being less wrong than, Yudkowsky, they’ll be silenced for all practical purposes. And I do think there was a time when people signalled by going against him, which was the proof of non-phyggishness. Phygs are bad.
You could try red-letter warnings atop posts saying, “there’s a rebuttal by a poster banned from this topic: [link]”, but I don’t expect you will, because the particular writer obviously won’t want that.
I was aware of disagreement between the priorities of existential risk and global poverty, but are there now people who consider animal welfare more important than both others? How many?