Any GPU can heat like a bitch. They just make the chip, they don't tell manufacturer's specifically to put whatever type of fan on their cards. It all depends on airflow.So why is it biased? Because there are simply more Intel cpus on the list?
That's like saying an automotive review critic is biased because he reviews more Toyota cars than Maseratis.
The website is biased because it's including the extremely high end processors, which Intel makes, and AMD doesn't. Unless you plan on owning your own supercomputer, this means nothing, because I'm talking about consumer level CPUs.
Also if you can't get why including one group more than the other is statistically biased, I have little hope for you.