You don't need to be lawyer. You can: 1) Consult your own lawyer. 2) Read the laws, do research and make a reasonable conclusion. If you can't sue people for "FUD-ing" Bitcoin, then you can't sue them for "FUD-ing" AMP.
This claim of his shows how nuts he is. I have never seen a guy that is so much full of shit as he is. He talks like a 5 year old.