@j12t in my experience, if something like this reads particularly fuzzy and has nothing to back it up it's 99%+ of the time either FUD, someone wanting to be important or a deliberate desinform. campaign.
I wouldn't give too much to it, honestly, and just plainly ignore it until it resurfaces from a source that actually backs it up. Usually doesn't happen.
Keep in mind that there are a lot of players benefitting from distrust (specifically to Signal) and put out bad information because of that.