I’m not sure about Reno DH specifically, that deck has no large scale data to go on.
I have a positive win rate against Reno warriors running 2x steamcleaner (one in ETC) as plague DK. The matchup is just horribly skewed in favor of plagues if the deck relies heavily on their highlander payoff card.
Same thing with shaman.
For most of the highlander decks, the steamcleaner is costing them more potential win rate in other matchups than it’s giving them from the times where you both queue into the plague DK, and it was the reason you beat them.