Why would they willingly destroy their successful honeypot if the other party announced they've access to it?

I haven't seen what's in it either though, but I would not rule it out yet, especially when the FBI is involved - which love those tactics

When you're compromised, changing the password is obviously not theatre - but changing a password which is randomly generated with enough entropy is what's pointless theatre. A secure password is secure, esp. If you're already using a password manager then the act of changing isn't meaningfully increasing your security (unless you're aware that your password was compromised) because the way to compromise it is what...? Having a keylogger on a device you logged in on? Then the changed password will be just as compromised