Sort of surprising that since they already taped the shows with Vanna that they wouldn't just do another week like that, just to fill that one missing week (they already have shows for the following week, using the "extra" 6th shows they normally do in when taping a week).
Most likely they don't skip the actual holiday (normally) since unlike Price is Right they aren't on the same network's stations in all areas, though simply plugging in one rerun for that day would probably work for those who do get to see it.
Wheel and Jeopardy! have always aired new episodes on Christmas Day, which I don't agree with since again, ABC stations miss out due to NBA, and other stations might run Christmas specials or movies in their time slots. Other shows generally air reruns on Christmas. I remember the syndicated version of Millionaire would air at least two weeks of "reruns" starting with the Monday of Christmas week, although these were actually the additional episodes that would air in double-run markets early in the season, giving most markets only carrying the single run the opportunity to air them.
Wheel did plug in a single rerun once on Election Day 2016 since pretty much every network was airing election coverage, but it was a last minute decision. In markets that did air Wheel, the TV guides still said it was a new episode but it was actually the episode intended to be the "Saturday rerun" for the week. I didn't get the episode that day, but some who did said they didn't realize it was a rerun until the past season's Bonus Round minimum was in the envelope.
To make up for missing an episode during the week, however, they slid that week's Friday episode to Saturday, which ended up being an even worse decision. A Saturday in November meant that most of the networks were airing College Football, so some markets didn't bother showing that episode at all (and guides still had it listed as the Saturday rerun, not a new episode), and most of those that did put in the time slot immediately after the College Football game or local news, and since College Football takes forever to finish and hardly ever ends when the TV guide says it will, the fourth quarter took over Wheel's time slot in most markets. My station had it scheduled at 7:30 and local news at 7:00 after the game, but because the game went until about 7:30, the news aired at that time instead of Wheel. AFAIK, that episode never showed up in the summer or Saturday reruns the following year, although the Bonus Round was lost from the looks of it.
