I agree with this. While the flavor of the year frontend stack might change, since 2008 when I started dabbling in frontend, the fundamentals really haven't changed: understanding DOM, understanding the JavaScript execution model, understanding the layout models, understanding the complexities of dealing with data binding over asynchronous events and simultaneous users, and so on. jQuery didn't change any of that (although it drastically improved ergonomics). Angular didn't. React didn't either.

My experience has been that paradigms and tools can move fast and are relatively straightforward to pick up. Deep understanding of the underlying problem domain and the systems underneath the abstractions is harder to pick up, but the concepts move more slowly.