Hm. I just went looking for some reference to support that impression, and only found stuff that frankly, totally contradicts it.

Typical of what I located is this, which on a cursory reading doesn't support it. And even more so on the basis of the reaction to it here, I have to conclude that either you have a misimpression, or you are using the term "dynamic language" in a completely different way to that which we are all used to.