That's an interesting result. They ran the tests on the very lovely, and very expensive, System76 Thelio Major with:
CPU: 3990X
RAM: 4 x 32GB DDR4-3000 memory
GPU: Dual Radeon RX 5700 XT graphics cards
Motherboard: Gigabyte-rebranded-System76 motherboard.
And also, AMD themselves recommend Clear Linux for top performance.
https://www.phoronix.com/scan.php?page=article&item=3990x-clear-linux&num=1
