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Sir , let me just explain a bit more, there is a nuance and a theory that was proposed, which is that as soon as the attack on the airbase happened there was some intentional chatter, with the all hearing American presence, being alerted that Pakistan was talking of an nuclear escalation therefore, what Ashley tellis alludes to, is that just the mere moving or involvement of any sort of nuclear asset will immediately bring the Americans in.
This could all be conjecture, however from reading this statements from the American side and from trump, they themselves have raised the nuclear threat, and it could stand to reason that they therefore align to the seriousness of Pakistan's nuclear capability