Thread is visible via Nitter, although the graph is missing from the first post
Seems to me that the part about increasingly inhabiting different spaces is likely true, even outside echo chambers men and women seem to have segregated socially acceptable interests that group us all into separate areas, both online and irl. Plus the whole death of the third place that people keep going on and on about, and less buying power to hang out in the pay-to-exist places.
With covid slamming us all headfirst into total isolation, and now work from home continuing it I would say the odds are very likely that this continues to accelerate exponentially because it's a feedback loop. The more time we spend apart, the less we have in common. Add today's chatbots to the mix that people will be talking to instead of real humans to relieve some of their loneliness and we've got a real problem.