Yes it is a shortage os lifeguards and the lazy river takes 19-20 people (plus additional resources for coverage of breaks). Most single slides take 2 people (one dispatch, on at the bottom), so those 20 lifeguards would equal 10 slides of resources.
I like the lazy river as it is a really long ride and a good way to cool of for more than a few minutes like a slide, but I get where the park is coming from.
The first few week HH-C was open, the last river was open, but it was cold, 62-68 degrees so no one rode it.
Now that we are at the mid summer point for the water park, I doubt it will reopen this season.