I suppose you would have us believe that, therefore, we are not at war with Iran?
Just because his statement has no legal basis does not mean that it is unreasonable to believe it will be enforced as-stated.
Indeed, this insistence on prioritizing the written law over the empirical reality borders on the delusional - if concentration camps were not the official policy of Nazi Germany, would you also insist we are making some mistake by "believing the lies" about their existence?
I just don't get what sort of point you're trying to make here - do you really think that the current US government cannot possibly cause problems for people that violate their unofficial edicts?
Do you really think a sensible legal department is going to advise their clients to antagonize the administration by using Claude for their "unrelated" commercial work?