In mathematical logic, yes--loosely speaking, higher order logic lets us use more layers of quantifiers (https://en.wikipedia.org/wiki/Second-order_logic)

Here, the blog is referencing Mark's book on investing (link is in the blog, but direct link here: https://www.amazon.com/gp/product/0231162847/ref=as_li_qf_sp...)

The Amazon preview includes enough of the first chapter (Marks calls it "second level thinking") to get a sense of Marks's meaning