That is confusing/questionable wording, but it can still be logically consistent. Here's an analogy: Football (soccer) is the most popular sport worldwide, but it is not among the top sports in the U.S.
Not necessarily. Bear in mind this based on survey results from Stack Overflow and the sizes for some of the categories are quite small.
For example. Dart is the second highest paid language globally but doesn't even figure in the top paying US (maybe because too few US Dart devs responded).