From those lines you quoted I don't see any reason to believe he's referring to dynamically typed languages. He's saying using an IDE on large code bases offers

From those lines you quoted I don't see any reason to believe he's referring to dynamically typed languages. He's saying using an IDE on large code bases offers benefits like not having to waste time compiling in order to catch bugs Also when you do a job it is not always the case that you can pick what language you're using so your solution doesn't make sense even if he was referring to dynamically typed languages.