That's a bit dramatic and inaccurate don't you think? Angular maybe comes closest to your definition of new language, but the rest is pretty much HTML with an @ sprinkled in. We've been using the same paradigm of double curly braces and such for quite a while. React may use more or less js, but I find it more mentally taxing to render or parse what is better expressed as HTML in a template. Outside of that, unless you've already been working with react a lot, the syntax of how data flows together is certainly not any more intuitive than Vue.
Just JS? What are those angled brackets in JS exactly?
React just uses js, almost plain.