The statistical techniques of text analysis described as being used by Ribeiro were developed in the 1960s and 1970s.  I used such ideas in an article I published in 1978.  It's very old-hat.  The statistical methods are worthwhile and will - when applied - help us indologists too, with cases like Kalidasa and Sankara.  The work of Oliver Hellwig on the chronology of Sanskrit alchemical literature is a wonderful case study of this kind of thing, but much more sophisticated than Ribeiro's work.  Ribeiro appears not to have the slightest awareness of the field of Digital Humanities, at least as he is represented in this article.