20 bucks says he's probably playing the non-reno version. There are a lot of decks that pro players bring to tournaments that are actually terrible. It's like they're in a parallel universe. Examples: dragon druid with duplicates, naga DH and Pip priest. I never ever see these played and when you play them yourself, they suck.
Every single pro player whined about naga demon hunter and said that reno decks were underpowered. Ive played around 300 matches this expansion. Literally went vs 0 pip priests, one or two duplicate dragon druids, and 4 naga demon hunters all expansion, yet in the last tournament I watched, those 3 were the most common decks. The rest of my games were vs reno decks and the occasional excavate DK or sludge warlock. At least 40% of the reno decks were 40 card reno decks too. The 3 pro-favored decks I just mentioned are significantly cheaper to craft than the typical reno deck too by the way, so the argument of "these reno decks are more popular for beginner players, that's why you see them more often" is totally bunk.
sadly, you're trolling today if you play a deck with duplicates in it. You can't compete with Reno the Lone Ranger unless you're playing a very specific strategy. Making a midrange, generic deck with 1 copy of each card isn't even a restriction in the current meta.