Getting an external GPU to work on a raspberry pi is a huge feat... PCIe support, functional drivers, these things don't just appear out of thin air. Jeff has been working on getting to this point for multiple years now.
I would recommend reading his blog posts on the matter to see how much progress there have been, as well as the issues along the way.
I like his content, but these sort of unbelievable thing on a raspberry pi articles with clickbait titles aren't particularly interesting when they essentially involve offloading all the work to an external component that is more powerful than the pi itself.
So not interesting at all then.