The "Freedom Phone" seems to me like either an elaborate joke or a grift.
I feel inclined to point out that ACRA, the crash reporter he mentioned, is a libre crash reporter that is commonly used in libre Android applications including the F-Droid client itself, generally in an opt-in manner and using a local email client instead of making a call to an external http server. Its presence isn't necessarily an indicator of evil although since they do not publish the source code for this Signal fork, it isn't clear (pun intended) how ACRA is being used here. Note that they aren't obligated to publish the source code to the public, but they are required to provide attribution and a written offer for the source code to anyone who obtains the binary. None of that is present in the download page or in the screenshots provided although it may be hidden somewhere in the app itself, but I don't feel inclined to look for it personally.