I am not sure if this really means they have fixed anything with STRX, it just remind me when we compared big Vega64/Vega56 efficiency with Integrated Vega11/12 which was quite efficient GPU.So 15% higher clocks and half watts after the fix? Time heals all wounds.
I am affraid itś the same case here, small chip with fewer CU can be quite efficient compared to big sized chips with a lot of CU´s