There's a significant difference between intentional colonization in the era of large ocean-crossing ships and languages spreading in an era of smaller craft without a central goal of expansion.

The Austronesians also had ships deliberately designed to cross the open ocean and had a culture that explicitly valued exploration and expansion.

So? Both examples under discussion are intentional colonization in dedicated ocean-crossing ships.

It's true that Polynesian ships are smaller than English ones. But that makes no difference to... anything.