Is the throttling when on battery, AC, or both?
I had a bizarre issue with the CPU throttling to below the minimum frequency but only when on battery. The solution was to clean the battery contacts. https://discussion.fedoraproject.org/t/laptop-cpu-dropping-to-unusably-slow-frequency-on-battery/68042
But mine has a removable battery while the T495s does not seem to. Still maybe something to consider.