Six Flags or not, seasonal park or not, realism or not: Nemo is correct that a ride of this caliber requires significant maintenance and attention to detail day by day. A story-based attraction has to tell the same story at the same high level no matter what time of day or season, and anything less will not tell the right story. The park has already learned the impact of poor (and positive) SFX investment over the years. Adventure Express, Flight of Fear, Tomb Raider, The Crypt, Phantom Theater, and of course Boo Blasters have all taught valuable lessons for what theming can do to an attraction.
The park chose to add this type of ride for this year knowing what it would take to put it at the top. What is conceivable to me is that they may not have the right people caring that those details are missed, or those people are limited by higher ups on what they can and can't do. While not a 1:1 example, I do think it represents the issue well. Take a look at how many burned out lightbulbs are around the park. Nearly every attraction, shop, menu, or roofline has something simple like this burned out, and they will go months at a time without fixing them. There's a park-wide permissiveness to let some things go. I think that's more of what we're seeing here.