Disputing the 6

Question T here is a recent article that seemed to not only question but undermine altogether the notion that it is recommended or rewardable to fast six-days in the month of Shawwāl [full text provided].  Is this correct?  In particular, the following comments were of note: There are no reports that the Companions or followers undertook the fasting of six-days in Shawwāl, if it was important, they would have done