The red valve head on the livewell wall is also a pump out and you can pull it out to pump the livewell empty. The plug is to remove the little water leftover below the fitting, out through the drain or bilge. Those items regurgitated from fish remaining in the well should be cleaned with a rag or other method.
We apologize if any inference was made in the wording you mention. In today’s world every boat made is a considerable monetary exchange and should be respected as such. The engines and engine parts alone are a considerable amount, nearing a 50% value of this models purchase.