You could draw a similar diagram in other contexts. Antivaxxers coming from the left-leaning hippy crowd and converging with the religious crowd on the right. Etc.
This sucks so much. It was so disappointing, I looked up to this guy a lot. His books were the key part in my radicalisation pipeline but now I see him praising Musk and other stuff like this :(
Sam Harris straight up started a "Free Will isn't real, now come cherrypick Buddhism and blame Arabs for destroying Europe with me!" cult, and became best bros with Jordan Peterson.