can you trust it when a researcher was able to identify Tor users 100% of the time in a lab experiment and 81% of the time in real-world tests [1][2]?
I know that you are doing this conspiracy thinking on purpose to confront Dessalines about their bias, but while this is not obvious to everyone:
While it is true what you say, it is beyond meaning for the most usage of Briar. The researchers result depended on a honeypot that served a large file. Don't have contacts that act as honeypot and you're safe. When chatting with strangers, the technique discovered by that researcher might not be relevant to Briar, but I have not enough knowledge to make a claim about that.
Clients are open source. Independent clients exists and they work. So the server must kind of do what signal claims, otherwise those devs would notice.