I agree that there is a lot of pitting, and that it does look like someone has "painted" (?) over the active rust.
When I restore pieces with this type of pitting, I try to get down as much as possible, but know that there will always be a certain amount of pitting left. The reason is that if you remove all of the pitting, there might not be much of a blade left or the blade will be too thin to be useful depending on how deep the pitting goes.
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