It's part of a paid smear campaign, intended to establish a belief that Linux is difficult and unreliable. Have you noticed how every discussion about Linux/Foss on Slashdot is centered on these weird corner-cases that almost nobody in the real world ever sees?
Well... in this case, not so much. When it comes to audio support the linux landscape is a minefield of poorly documented, often unstable crap with poor interoperability. In other words, most of it is shit. None of it works well without considerable tweaking, after spending far to much time and effort running down solutions in those support forums. Don't get me wrong. I make my living running linux boxen. I am also a semi-serious audiophile and would love to use linux in that pursuit as well. Can't do it.