All professional overclockers has. And sometimes from multiple sources like Intel, Nvidia, MSI, AMD, Gigabyte and so on.If Buildzoid had access to the exact same hardware, he would come top of the benchmark most of the time. He has the knowledge to "Hardware MOD".
This is a big advantage over most overclocker's out there.
You have to remember, he has access to many of the same CPU/GPU. So he can cherry pick the best one for overclocking. Not many user(s) has access to 10+ Ryzen 1800X.