Sorry it was a bit confusing.
Answering your question, the assets shown are the same as the basic version, they do not come in another resolution.
What I was trying to show is that in Extra (Godot) you will have:
- Preconfigured resources (8px, 16px)
The base tile for each shape, the texture origin for each tile and the colliders for the physics layer.
- A scene with 2 built examples (the ones shown on the page) One in 8px and the other in 16px.
- Configuration guide, which explains how to prepare the resources offered from scratch in case you have any doubts.