Could this be considered free speech? Most of the limitations I know of require you to say it to or in front of other people as to create a panic or make someone feel threatened. Is it a crime to say to yourself "Im going to blow up New York." or about threats of self-harm? How about "Im going to steal the Mona Lisa!"?

To me this is just straight up thought crime, they just don't have a way to directly read your thoughts yet. But they will spy on you and try and catch you out for it.