You should remember that the context of the jokes was about the statements from ex-FBI's head James Comey on encryption backdoor in the middle of the Crypto War 2 back in 2016.

> "(with encryption) Everybody is walking around with a Swiss bank account in his smartphone if government can't get in. You cannot take an absolutist view on this (, and we must add backdoors)."

Replace "smartphones" with "brains".

> "(with encryption) Everybody is walking around with a Swiss bank account in his brain if government can't get in. You cannot take an absolutist view on this (, and we must add backdoors)."

Get the joke now?

Brain activity isn't a cipher.