I am near certain that the actual Chinese satellite images are at a significantly higher resolution than those that they've provided to the rest of the world. They are, more than likely, reduced resolution versions so we are not aware of the actual satellite capabilities of the Chinese.
You may also find they might have done some extra modifications to make sure that there can be no extrapolation from the reduced resolution images. so as to not infer what the true capabilities are, if that is even possible.