Hi there. I'm not clear on what you're claiming about Signal. Its initial release as RedPhone and TextSecure, as well as it being briefly pulled from the appstore in 2011 when Marlinspike took a job at Twitter, may be throwing off your research. The Signal Foundation was announcement wasn't made until earlier this year. (https://signal.org/blog/signal-foundation/)
A Mastodon instance for info/cyber security-minded people.