[ghusbands]

A common misconception is that git works with diffs as a primary representation of patches, and that's the implied reading of "stores diffs". Yes, git uses diffs as an optimisation for storage but the underlying model is always that of storing whole trees (DAGs of trees, even), so someone talking about it storing diffs is missing something fundamental. Even renames are rederived regularly and not stored as such.

However, context would matter and wasn't provided - without it, we're just guessing.