The author having worked with various technologies over time is also not an example of "deskilling", it's a way of asserting that they have had time to observe the deskilling of the domain (since deskilling means a particular domain requires less specialised skills than it did before, not that the workers are losing skills) happen.
When something goes wrong, no one understands anything.
Low accessibility, terrible performance, lack of any fundamentals of html and css, abuse of those awful solutions like Tailwind or using 2016 technologies like React for rendering what should mostly be static websites + some web component, all plagued by memory leaks and very basic usability bugs.