I'm confused at the question too and (+1) found the paper link interesting, but just being devil's advocate here: I would argue that people have been using DNA sequence data (the use of "barcodes" evolved from markers such as rDNA and, like the example in the paper, COI) to reclassify organisms since we started sequencing nucleotides. One major case being the classification of the Archaea by Carl Woese et al. in 1977 based on DNA marker data.