I feel it's actually kind of smart. Most people won't be reading the blog post themselves, they'd ask GPT to understand the text and fetch the summary or whatever is relevant to them. The author has directly made the resource such that it is optimised for the output after that mostly-everyone-would-do-this step.
Don't know if this is what you want to do or not, but you can actually change app icons for Applications however you like if you have the alternate that you want it to be.
I'll tell you how
Applications Folder (in Finder) -> Right-click on the target app -> Get Info -> Drag-and-drop the intended icon file to the top-left corner where the original icon is present.
Ik it's just a way to customise and not something official but your Mac looks the way you want it to.