He indirectly recognized the importance of declaring the shape of data 6 years later by introducing spec, which to date still has big issues and screams "just use a proper statically typed language".
Maybe Hickey just didn't prioritized "types" as high as some other ideas to spend his time on. And in my opinion he focused on the right things and achieved something really great.
As general advice stay positiv, focus on the things you like instead of telling everyone what you don't like, it's better for your mental health ;)
I think this statement is unfair.
I don't think there is a widely used statically typed language that is nearly as expressive and simple as spec. Also the opt-in nature of it retains the advantages of dynamic typing.