I think it is just Ireland though (which is why I added Ireland to the title).

He says nothing about the PIN, so I don’t think that is what protects Signal as OP writes. It simply doesn’t rely on SS7.

You only type your PIN into Signal about once a month.

I found it confusing. Did he explain how the IMSI number is obtained?

Towards the end he said there was a special “interrogation” command that would reveal the IMSI but that loophole is now closed.

You make it sound like an arthouse movie yet it is the extreme geeky opposite.

Or were you talking about AI summaries in general rather than this one?