Have there ever been MBPs that did not throttle?
Let me rephrase the question: has ever ever been any laptop that did not throttle? Practically every computer that features a CPU with turbo boost throttles — that is part of the normal CPU operation. Last machine that didn't throttle was back in the days before turbo boost became a thing.
I am not aware of any MBP that would actually throttle. Even the touchbar models that have bad rep in regards to throttling had absolutely no problem maintaining sustained clocks over the nominal. I never understood why some people call running a 2.4Gzh CPU at 2.6Ghz "throttling".