Assuming he's talking about the plastic wrapping on the handle, it will not increase swingweight. Adding weight to the handle barely has an effect on swingweight.
And the moment he says that increased SW he measured without plastic is alteration by one... Cmon, removing things cannot increase the SW. He should have done multiple measurements (10 min of vid would actually fit that in) and come to a conclusion there're some measurement margins and that's it.
thanks everyone for replies. I only asked because I am considering buying a racquet at a local shop and I wanted to get something close to spec in weight and balance. Really just trying to eliminate outliers.