Yes, but their claim is specifically about (quoting my other comment):

> It appears to describe a data-oriented component entity system in which all data types within a component are assigned to chunks (batches) in such a way that they can be optimally grouped with data from components of other entities for optimal memory access.

This is not new either. I and others have done this for years. The term "archetype" is something they made up to describe something that has been done many time before.

Edit: It appears that the term "archetype" was introduced somewhere in the last few years. Not sure then if it is specifically coming from Unity.