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the suction you are talking about is lift
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No, suction is what happens when the boundary layer seperates.
Watch the tufts, they reverse direction at the stall point for the section. That is a vacuum over that part of the wing creating suction. You can see the tips of the wing over the ailerion is still flying nicely while the inboard portion of the wing is stalled.
Buffet comes from a portion of the wing stalling. It does not mean the entire wing is stalled or the airplane is not in controlled flight.