MediaTek has been accused of artificially inflating benchmark scores on some of their devices. The shortcoming came to light when a reviewer found that a Helio P95 chip outperformed a Dimensity 1000L in PCMark. Some digging revealed that MediaTek has 'whitelists' for popular benchmarking apps. Whitelisted apps are allowed to push the device's SoC far beyond its limit, resulting in higher benchmark scores.
https://www.notebookcheck.net/MediaTek-accused-of-cheating-in-a-host-of-popular-mobile-benchmarking-tests.460226.0.html
I don't think there's any case of cheating and perhaps AnandTech is in a paid partnership with Qualcomm or Exynos as it's the liability of a smartphone brand to put some performance boosting functions, not a chipset brand.
What is AnandTech trying to prove by this? Snapdragon and Exynos have been cheating people since long and we have accepted it as an industry standard. Besides, I guess it's the smartphone brands to be blamed and not the chipsets for this.