It’s an overly broad brush and the motivations don’t really resonate with me.

Most economists are labor economists and couldn’t care less about what’s going on in finance.

This is specifically about the fairly small minority of macroeconomists. Even there, I agree that they rely on bad mathematical models (most of them seem to realize that too, btw), but I think they mostly do it out of expedience rather than those other factors. To the extent they actually are enamored with finance, my sense is that it’s because they can test their models on financial data.