No,that is not what he mean.
Mp 777 means that lower the port is wast of time as it is prooved that it is better for engine if piston goes .5-.6 mm lower than exhaustport in BDC. You should remeber one moore thing. If you lower ehaust port to much you can have a problem with fresh gasses going past piston and out in exhaust system while piston is at TDC. Never mesured it but it can happend.