I think this is coincidence and a lot of mental gymnastics.
Spaceship Earth has been borderline uncomfortably warm in hot months for years now. My guess is there’s some HVAC component that’s failed, and it would require substantial down time and cost to fix because of how it’s installed. WDW was probably waiting until the on-again-off-again refurbishment to replace it.
As for the other reports, air conditioners are mechanical systems. While they’re robust as far as mechanical systems go, they do fail from time to time. The “sweating in restaurants” bit appears to be one report, in that clickbait piece, about someone complaining about Hacienda. Given that WDW-adjacent media have devolved into a puke funnel for hysteria, it’s being made out to be much larger than it was.
Most of the HVAC in the parks runs off of enormous centralized chillers. Those kinds of systems run 24x7 already. They’re basically on or off, so there’s not much adjustment that can be done.
Electricity has not skyrocketed in price in Florida. Most comes from natural gas, which hasn’t had the price shocks of oil. The Crystal River nuclear station also supplies central Florida. WDW has also been steadily increasing its share (currently 40%) of electricity from renewables, primarily solar. The great thing about renewables is that once they’re online, their only recurring cost is maintenance.