The boat will produce a wake behind it whenever it is moving forward.
It is not indicative of what the props are doing under the water. They could be in full reverse, but it just takes a long time to slow, and finally stop.
Sure, off the sides of the boat, the the water color won't change without cavitation from the prop, and the center wouldn't be like that, it'd be from the sides.
in years of captaining charters (admitably on smaller boats than this) pretty certain that wake is from being under power.
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