I think it's the opposite. You can't be hyper-social in a thousand hour long sushi packed train ride. Urbanization suppresses real human connections. That creates demand for mock/fake environments that simulate "parking lot" environments where it would not be too inconsiderate to be social. All the successful examples of these parasocial contents eventually grow communities around them.
(Not that I think this particular one goes anywhere, no way.)
Sorry, but you just made my point. Urban train rides are already an effect of advancing technology. Being packed like sushi simply wouldn't happen if we hadn't become addicted to advancing technology. That's a central tenet of technology which only occured around the 19th century. AI is the next stage and the apex of this process which alienate people from each other.
(Not that I think this particular one goes anywhere, no way.)