Haha, this article is funny. Whoever wrote that had no idea what he is writing about.
What of the term *lossless* in FLAC is so hard to understand? There is *no* difference in quality between AIFF and FLAC. FLAC is doing compression, but it will always restore the *exact* original waveform.
For CDJ / XDJ it will not make much difference, for AIFF the player has to do less CPU work because no decompression is required. Personally, I am buying my music as AIFF and keep it as this in Rekordbox / USB export.