I didn't say anything about financial analysis. But static typing is a good defense mechanism against type errors at runtime (I don't think anyone would argue against that). When you're running a financial services product, the cost of a type error in production can be dramatically higher than in non-financial code. Speaking from firsthand experience.

I don't think it's specific to financial services. He just meant that financial services is an area where you really don't want bugs! And one of the easiest ways to eliminate entire classes of bugs is to use static typing.