Meaningless.
The correct question is: how much more or less would they make if they were applying some other philosophy?
At least in the context of this conversation.
And, an increase in profit of $340 million across 13,882 stores (in the US) is less impressive.
And presumably that $8.563 billion is McDonalds corporate and the franchisees didn’t see all of that gain.
This is meaningless because it's entirely hypothetical. If McDonald's is only looking at quantitative data the "bad outcome" hasn't come for them. It seems quite successful in fact (especially in these tough economic times). Maybe if leads to a massive failure we can come back and revisit this but for now, based on facts, it's working just fine for them.
People like to believe that enshitifying everything will eventually lead to failure because sucks for us. It does suck for us. But I'm not convinced that karma is coming for them.