It says so in the article, but carefully hidden in plain view so that the reader is not likely to be distracted from the sensationalistic first glance message: whenever it talks about warming caused by wind installations it is explicitly qualified as local warming. People with an existing anti wind power bias will conveniently miss that detail.

By the way, the numbers stated seem to be much lower than the differences in local temperature you would get by building a city, planting or harvesting a forest and so on.