Actually, his article is pretty ridiculous and does not match the title. He has a couple valid comments, but contradicts himself several times and did not do proper DD before writing it as several points are questionable at best.
Unfortunately, we do not know whether UGGs are going to sell adequately this year. So the article is right to raise the question. This is a continuing issue -- it arises every year -- and it is in my opinion the primary risk in this stock and the primary reason the shares have fallen in price as the 3Q earning approach.