I am not the one setting arbitrary criteria for this attraction above and beyond the standards other stores and attractions in the area are held to, so I'm not in any cycle you've imagined; my opinion on the matter remains unchanged in that this would be no more immersion-breaking than other lighting in the area. Even if you discount the obvious floodlights and recessed lights all over the place, locales like the Diamond Horseshoe, for example, have very clear modern spotlights illuminating their signs at night as well. A themed light is superior, but these things have never been universally well-hidden in all cases for the entire lifetime of the parks. This is not an example of declining by degrees; it has always been a concession in some cases. This on top of the fact that you're basing your opinion on a design we know to be outdated relative to what has been installed.
There are many legitimate things to complain about that will either certainly or potentially impact this attraction's ability to fit into the land. This probably isn't one of them.