I think the author's recommendation has some needed context:

> Recommendation: either make your language statically typed or dynamically typed (preferably statically typed, but that's a different topic), as gradual typing just doesn't make sense for new languages.

The "for new languages" part is really important. Gradual typing makes a lot of sense when you are trying to retrofit some amount of static checking onto an existing enormous corpus of dynamically typed code. That's the case for TypeScript with JavaScript and Elixir with Elixir and Erlang.