Regardless that particular point stands even if he's not the messiah anymore, that he was heralded as a saint who bestowed on humanity the right to privacy, and that we should trust in him.
From what I can find about the entity that funded Signal from the government it seems to be a lot to do with the CIA and anti-censorship products designed to disrupt other countries... Which, actually fits with the narrative of censorship resistant messaging, at least -- so no reason to think that it betrays the stated mission of Signal
The foundation that funded them used to be called: Radio Free Asia (which on inspection seems to be considered propaganda, though seems to market itself as free media), now called OTF, if you see the list of other software they sponsor it's very much in the same category: https://en.wikipedia.org/wiki/Open_Technology_Fund
So, I recant those statements about NSA, I only know that a number of people in NSA are not using Signal, and I had heard about NSA funding from somewhere, which obviously is not true.
EDIT: It appears the link to the submission has been slightly altered to break it; it should be: https://blog.dijit.sh/i-don-t-trust-signal