I would say that is still applicable and valid. like any huristic, there is opportunity for abuse, but this isn't new.

I think what the huristic gets at is the idea of like mindedness and similarity.

It would be interesting to explore the opposite effect, whee the information shared is hostile or unrelatable. Would people still feel more understood or less?

What would the reaction be if the information shared was "I am from a hostile tribe and hate people like you"