Expertise is generally pretty narrow. For instance, I heard him speak about bio and pharma about half a year ago and he made several statements that were categorically incorrect and poorly reasoned through.
This sounds like evidence that his knowledge is wide, not narrow
It's evidence that he's willing to talk about a wide range of topics, not that he has great knowledge in those areas.
No, making statements outside of his primary domain that are categorically incorrect isn't a sign of broad knowledge. It may be a sign that he thinks his knowledge is broad when it isn't, but there are other explanations.