The article is not backed up by reality. Why would use anything but a domain-specific LLM, if they actually worked? The author is probably confusing RAG with

The article is not backed up by reality. Why would use anything but a domain-specific LLM, if they actually worked? The author is probably confusing RAG with pretraining. You can RAG on PubMed but you can't arrive at a competitive model by pretraining solely on it.