Here's an idea...
There's no reason someone like Goldberg would have been invited to a secret meeting.
Even you know that.
Given that the NSA issued a warning of Signal group chat invite links from suspicious sources.
(
https://debatepolitics.com/threads/mike-waltz-claims-‘full-responsibility’-for-signal-chat-group-leaked-to-journalist.565238/post-1081292098)
. . .
Signal
responded to the bulletin in a social media post Tuesday, saying the NSA's "memo used the term 'vulnerability' in relation to Signal-but it had nothing to do with Signal's core tech. It was warning against phishing scams targeting Signal users."
"Phishing isn't new, and it's not a flaw in our encryption or any of Signal's underlying technology," the company said. "Phishing attacks are a constant threat for popular apps and websites."
The National Security Agency sent a bulletin in February warning of Russian hackers trying to access encrypted conversations on Signal.
www.cbsnews.com
"It" (the NSA document) "was warning against phishing scams targeting Signal users.".
The NSA guidance on Signal (follow
documents provided to CBS News link) is, in fact best summarized by, 'Don't go following suspicious QR codes or links from suspicious sources inviting the user to a group chat, and you won't compromise your Signal security.'
Further, the NSA guidance on Signal, as provided in post
#254 and elaborated on in post
#270 doesn't even say Signal is prohibited from use.
What it does say:
Signal the application is secure.
Now matter how secure, it can't prevent a user from falling prey to social engineering and following those suspicious QR codes or links from suspicious sources which link another device as it were the user's own device. That's beyond the app.
Anyway, why does it seem like someone forwarded the group chat invite to the wrong person?
Or maybe someone else forwarded the invite on behalf of the group?
This is precisely the type of social engineering exploit which the NSA curiously, and rather suspiciously, warned about just last month.