I have, and no where did I find the word "throttle" or a mention of a lower processor clock frequency.
That does not provide reliable information on the actual processor speed. Just an upper bound. Hypothetically, the processor could actually be running faster, but mostly be busy with other OS processes or tasks, or blocked by such, and the benchmark would report a misleading lower score.
Sorry, but as an iOS app developer of high frame rate apps, I've likely written a lot more benchmarks than you have, and know more about the possible flaws. So I don't trust benchmarks on closed OS systems without a lot more physical engineering data.