Seems that if you used fining agents such as bentonite and Isinglass, you could make the byproducts precipitate to the bottom of the container, then rack into a new container with a auto siphon or siphon hose after two to three weeks, make sure to avoid the sediment at the bottom of the container.
To my knowledge, you cannot remove fusel alcohols with finings.
Technically volume is lost by the production and subsequent loss of CO2. I sincerely doubt that it'd be noticeable though.
I agree that it wouldn't be noticeable in your average batch of beer or wine, but he likely has a lot more fermentable sugar in his brew than we do. More sugar = more CO2 and alcohol = more of a chance of noticing the volume loss, right?
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