Do you have the exact same remote at home
and was he fully hard?
I don't know about you but my 6 inches can actually get a whole inch longer when fully erect. And, as we've seen with for example Mandingo, a big dick can be hard (impressive enough) but when it gets at its hardest, that's when you're supposed to have a measuring tape close by.
I'm sure all you non-pornstars wait until you're fully erect before you measure it,
but a real porn producer might think "so what if he's not at his best - the one measuring will just roll up the first 3 inches of the measuring tape anyway, so why bother wasting time fluffing?"
I've never seen a porn star get measured when he's at his hardest. Never.