Gimp exports to PNG pixel for pixel.
Then it is not dithering, it is blurriness. It depends on the interpolation algorithm used for scaling. In an editor such as Gimp you want to see pixels when you zoom in so the zoom does not interpolate, but other image viewers can make other choices.
Here is how your image appears in my image viewer (Gwenview):
![[Image: OzdUstZ.png]](https://i.imgur.com/OzdUstZ.png)
Then it is not dithering, it is blurriness. It depends on the interpolation algorithm used for scaling. In an editor such as Gimp you want to see pixels when you zoom in so the zoom does not interpolate, but other image viewers can make other choices.
Here is how your image appears in my image viewer (Gwenview):