Sure it is: but how do you know if it really is the source code of Signal?
For all we know, both the Signal network and its client are a half-baked "secure" and "private" chat, and the source code they publish is an elaborate decoy (though probably a subset of the real underlying code, for obvious reasons).
For all we know, both the Signal network and its client are a half-baked "secure" and "private" chat, and the source code they publish is an elaborate decoy (though probably a subset of the real underlying code, for obvious reasons).