“When you use Signal, your data is stored in encrypted form on your devices. The only information that is stored on the Signal servers for each account is the phone number you registered with, the date and time you joined the service, and the date you last logged on.”
Maybe, but I find it more likely to be true than false. My overarching takeaway is that if you actually care about the secrecy of a communication, don’t use signal, use gpg.