I remember emailing him once while at MIT to invite him for a dinner series that I was hosting back in the 2010s. He couldn’t attend but sent a long and beautiful reply. Remarkable, how approachable he was for being such as a hallowed figure. RIP!
He is very approachable by email. I have heard this from other people. He even wrote back to an email from my horrible step-mother. (My father and Noam were in the same Hebrew classes taught over multiple years by Noam's mother in Philadelphia. Noam was a good student or so my father told me.)
*I'm not humble bragging, nor passively-aggressively diminishing that Chomsky replied at length to your invitation. I have heard that he was accessible by email to many. I have rarely if ever heard that he wrote ANYONE a long and beautiful reply. As you said, that is remarkable. Also, he is still alive as of 20 June 2024.