Although, I'll definitely agree with you that all points in history are unique. Thucydides Trap shouldn't be understood as predicting the future using the past (that's absurd by definition). That would be a reductio ad absurdum, but it isn't what foreign policy scholars are actually arguing here.
Instead, it's a description of set of incentives that shape the relationship. What the individuals in power choose to do with those pressures/incentives on the relationship is absolutely a different question. The point the "foreign policy elite" in the United States are making is that it has strong incentives to agitate for a fight with China, before it becomes an competitor (as opposed to a "near peer competitor" or "pacing challenge" - the current language).
I suppose its worth clarifying. Do you deny that there are such structural elements of the Sino-American relationship? Or is your argument wrt Thucydides Trap that it isn't deterministic? Or something else?