The only thing I can think of at this point is that somewhere along the way someone from RIM pissed off Instagram, Skype, Netflix and many of the major players.
I mean Windows Phone 7 has all these apps. BlackBerry should too!
Its all about profit and device market exposure. At the time and even now The PlayBook has a really small market share (hopefully BB10 will change that), and big time companies are not looking to invest in a device that has a small market share.
Comments section in the venturebeat article summarises the credibility of the article. so no need to discuss it further.
Skype is moving towards carrier billing. and i would assume carriers would want it on as many platforms as possible. so i dont see any reason why skype wouldnt make its way to BB10. if not at lauch, it should be there shortly after launch. i dont have the link right now to prove that skype is going carrier billing. But will share it when i have the time to find it.
also, skype is an individual cost center for MSFT. and cost centers should worry about maximising their revenue and not be a scapegoat to MSFT's mobile strategy. unless it some how fully integrated into WP8 and not available on any other platform. But as its not exclusive WP8 anyway, i think its in the best of interest of Skype (as a cost center) to be available on all platforms.