It's definitely a common sentiment in the LISP community. It's probably valid if your tech is not linked to some platform/language/env that doesn't work well with Clojure.

I'd say the main argument against it, is that a decade ago the divide between LISPs and stacic languages (basically the mainstream at the time) was indeed huge. While today if you don't use a LISP you're probably going to go with a fairly dynamic and functional language anyways.

I'd only be wary if he has an absolutely religious conviction it's true. If it's an educated bet then it's fine in my book.