Not sure where they are getting their numbers, but in 3DMark, the iPhone 15 Pro Max is way down the list. My phone, the ASUS ROG Phone 8 Pro is currently number one on both the Solar Bay and Wild Life Extreme tests in 3DMark.
Solar Bay: Mine: 8,649; iPhone: 6,100
Solar Bay Unlimited: Mine: 8,678; iPhone: 5,726
Wild Life Extreme: Mine: 5123; iPhone: 3,639
Wild Life Extreme Unlimited: Mine: 5080; iPhone: 3,466
So I'm not sure where they are getting their numbers, but the iPhone is far from the top of the list. Around rank 21 for the Solar Bay tests and closer to 40 for the Wild Life Extreme tests.