Wow, that is so thin it is transparent. If this is the sort of 'proof' that we are going to find then I am glad you posted the ref here so that I could add yet another kook to the list of those whose privacy/security rantings and books I can ignore. The biggest danger to long-term privacy projects is not the risk of taking advantage of an opportune partnership with a government agency when incentives align, it is conspiracy nutjobs poisoning the well with their paranoia and delusions.
Are those "facts" avaiable for investigating, without having to buy the book?
(that Tor is partly US administration funded is known, but Signal? And what is OTF and BGG?)