Earlier quoted context omitted.
In 1994 I did contract work for a serious businesses that ran commercial pay-for-click information website that ran fabulously on Linux, 1.2.x kernels. Since I first started using Linux in 1993 (0.99 patch level 12), it has always been a functioning kernel.
Anyone can write a functioning kernel. The question is if it provides all the functionality required to run complex modern software -- especially big databases, which was pretty much your defacto benchmark back then. "Linux doesn't provide these syscalls or anything comparable" might mean you go from "runs reasonably well" to "can't run on this hardware at all because the kernel doesn't know how to do these tricks wi…
It's the first time however I hear anyone claiming as much credit. Oracle didn't even start dabbling with Linux until 21st century, and it was already a decade old project dominating Internet server deployments at that point.