It isn't about the console wars. Playstation 3 pulling itself ahead of the Xbox 360 in sales means more than throwing wadded up sales charts at each other (though the Playstation fans have handled the lead in the HD console race with a lot more maturity). The importance behind this event is the implied principles.
While the report is technically unofficial, the Ps3 and 360 have been neck and neck for a long time. The Ps3 released an entire year later than the Xbox 360 (and a year and a half in parts of the EU). The Xbox 360 had an exponentially worse failure rate than it's 7th gen counterpart (and while many were fixed with warranty, they were not completely replaced with something more reliable, leaving several consoles with a similar chance to eventually die post-warranty), to the point that the ps3 may very well have more working consoles out there anyway. Even if the report is wrong and the ps3 is still climbing a few 100K, does it matter if more people are enjoying working Ps3s?
Thus, even if they're perfectly even or off by a little yet, the fact remains; the Ps3 sold as much as it did and in LESS time.
So what are these principles? While the ps3 couldn't reach lofty sales of a system that sold to retirement homes, families, and other groups that made for a Wii with a smaller attach rate, it appears to still be king to the core gamers.
A system that has provided more true exclusive games, an open HDD format, free online play, took a risk with a big disc format, took a risk with unique hardware, etc.....managed to do that well with less advertisement, a higher price, media that clearly gave it more flak, etc.
A system that did all those things can still be popular with so many things working against it. THAT is why it matters.