Because if you look closer at the data in the Geekbench browser, it’s kind of shit. The iPad entries are probably not too far off, but there are a ton of entries that are obvious garbage, like a Pixel 7 Pro with a Ryzen 9 5900X. Also, a lot of system names are VM hypervisors. In a VM, you can control the realtime clock that the Geekbench profiling software sees, so you can just kind of dial whatever performance number you want.
Geekbench obviously just takes the average, but the average of garbage is still garbage.
Some of the number are faked. The only person who knows the accuracy of these one are the people who posted them.