I agree. I don't think this in particular will land us in "land of no trust." I think it, and innovations like it, move us clearly towards that land though.

The advent of widespread photo/video evidence was a big help for people trying to interpret was real and what wasn't. Then photography was knocked out of service by e.g. Photoshop (generally "easy photo manipulation"). Now video is getting knocked out of service as well. So, yes, it removes a useful tool in interpreting the world's evidence, and it's not clear what will replace that tool (if anything).

To be clear, the "no such thing as trust" was specifically a response to GP's assertion that people will "have to unlearn that seeing is believing." Okay, fine, but then what can you believe if you not even what you see? Again this specific tech doesn't get us all the way there, but it gets us closer.