I mean, he is saying the exact same thing you are saying - Intel kept making quad core CPUs for ages, bevause....they could. They had the tech to make CPUs with more cores for years - my workstation at work 5 years ago was using an 8-core/16 threaded Xeon chip. The only reason why it wasn't available branded as an i7 was that they wanted to keep it to the more expensive enterprise platform.
What do you think it's more profitable to sell: one CPU with many PCIe lanes that you can attach 8 GPUs to (8 NVIDIA GPUs for 1 Intel CPUs), or more CPUs with fewer PCIe lanes (8 NVIDIA GPUs for 2 Intel CPUs)