GPU Turbo for selected Honor and Huawei smartphones promises an up to 60 percent increased efficiency on top of reducing energy consumption by 30 percent. A software update is supposed to achieve this. We took a closer look at Turbo during daily use in order to determine whether it is able to keep this promise.
https://www.notebookcheck.net/Huawei-GPU-Turbo-Review.328116.0.html
The initial theory is that GPU Turbo hardly works beyond specifically optimized games, both of these games you tested have already been specifically optimized, however the majority of games haven't been optimized and you haven't tested any of those (I expect them to perform like GFXBench). There's nothing new to see here.
It doesn't matter, the phone is so much smoother even outside of games, just scrolling web pages or navigating the phone. Butter smooth.
You didn't test power consumption and temperature.