For those old enough to remember, all of these types of staffing/budget/licensing complaints are identical to what happened to Australia's Wonderland when Sunway took over. It took them 7 years to run the park into the ground before closing it.
BGH have zero people experienced in Tourism/Themeparks/Hospitality operations. They are mostly invested in healthcare and digital businesses. They choose the management of the parks. If they don't know how to identify the right people, then the wrong people will get the job and the wrong people will hire more wrong people under them.
I don't think the parks are at risk of closure, but this is a problem that takes a long time to fix.