It doesn't mention static typing at all. It only mentions static scoping. In fact, the article credits to Lisp dynamic typing. Also, the article doesn't credit

It doesn't mention static typing at all. It only mentions static scoping. In fact, the article credits to Lisp dynamic typing. Also, the article doesn't credit any specific features to McCarthy. It credits to him Lisp itself and the idea that both code and data can be represented as lists, and then it credits to Lisp the invention of certain features, like first-class functions, garbage collection, etc. I don't think the article intends to imply some transitivity of credit.