You can't underestimate the importance of actually reading the article. The scientists actually say one possibility is that it's just snowing less up there right now. Then they reject that hypothesis. Presumably because it does nothing to enhance global warming theory. Meanwhile, there are entire regions of Africa that supported millions of people for tens of thousands of years facing starvation because of decades long droughts.
Deforestation by local villagers = dryer air around the mountain = less percipitation on the mountain = less snow.