Focus on the word "labor" in the passage below:
A new fireworks show brings with it new labor costs. If new labor costs are incurred, then, an equal amount of labor costs in other areas have to be cut just to remain at current levels. So if you want to cut 20%, you have to cut the labor costs that equal the added labor costs plus 20% more. Now, it is certainly possible for Disney to reallocate labor from one area to another such that a person does not lose their job or have their hours cut. But if a person who is moved from helping to organize the Anna & Elsa meet and greet over to DHS for SW fireworks crowd control, then the A & E crowd control efficiency suffers. And moving a person from the MK to DHS doesn't achieve any labor costs savings. So the 20% reduction still has to come from somewhere. So the net effect is a decline in efficiency at A&E, plus 20% labor cost reductions elsewhere.
Still not how it works.
Somebody didn't wake up Monday and say "cut 20%", and on Tuesday someone said "Add fireworks", and on Wednesday someone said "Now cut 20% + add fireworks and cut 20%"
More than likely, the 20% cuts are being used to pay for/offset the addition of these new things. So, they expected Shanghai to be open by now, they hoped AvatarLand would be ahead, they had overruns on multiple projects. The dollar got stronger making cash movement more difficult. All these things happen that put downward pressure on costs.
Then, you have the individual park heads looking at this and saying "We can't wait... we are ready to move with this next generation fireworks show"... "We have a stage show ready to go"... "We have the costumes for Phasma and a battalion of Stormtroopers and everyone loves the Stormtroopers walking around Launch Bay". So, they have decisions to make. You can't just spend more. You can either wait for the inflow of cash to improve, cost overruns to be controlled, delay capital projects, or cut costs. So they cut costs in order to pay for the new things. Then, they will re-balance.
So, the announcement about the fireworks and shows actually is an indicator to me things are better than suspected. The way these things work, and knowing what we know, this is beginning to smell very much like capital overruns and delays caused pressure to cut costs in order to introduce new features.
But to say this is going to make things even worse... that its the 20% cut plus add the new show which makes it feel like a 24% cut (or whatever) is fundamentally flawed.
The new DHS shows were budgeted for $X. Management was told to either wait (due to Shanghai delays, pending capital projects, and existing overruns) or cut enough to offset the $X. They chose to cut in order to offset $X. (No secret mouse told me any of this, but I know from past experience how theme park expenditures and capital works, and I know how Fortune 500 expenditures and capital works. Disney is not unique in that respect).