Not quite. The central argument is that LLMs tomorrow will be based on what LLMs output today. If more and more people are vibe-coding their websites, and vibe-coding predominantly yields React apps, then the training data will have an ever larger share of React in it, thus making tomorrow's LLMs even more likely to produce React apps.
I'd note that people learn and accumulate knowledge as new languages and frameworks develop, despite there being established practices. There is a momentum for sure, but it doesn't preclude development of new things.