Don't want to hate on the author's post but the screenshots being slow to load made me chuckle, understandable as images can be big and there were a lot, but just found it a little ironic.
These days, slow-loading images usually mean that somebody hasn't bothered to use any of the automatic tooling various frameworks and platforms have for optimized viewport- and pixel density-based image sets, and just stuck in a maximum size 10+ MB image.
Which absolutely false for the website in question
Could you suggest some of those automatic tools?
Yes, next/image which is part of Next.js Framework </irony>