Typically these things are targeted towards providing employers modifiers for how much to pay employees they send abroad. In this case, the definition of expat probably doesn't include retirees or alcoholic dog kickers. A typical working expat's wages aren't tied to the economy they are working in.
Also keep in mind that of 159 countries in which expats were polled, only 46 made the cut for receiving enough data. Ranking #35 is bottom feeding.
I'm guessing the expats in this survey were mostly white, considering that the Philippines is among the most racist countries in the world.
These things have limited usefulness. Singapore is great. The U.S. and U.K. are expensive and you get worked to the bone. Countries in S.E. Asia are great if you are young and single. Anything else at the bottom is for collecting a big paycheck and GTFO ASAP. That's about all you can take away from this.
Putting together questions, running a survey and interpreting results without major errors and bias is really difficult. I trust these things about as much as I trust my horoscope.