Michael had been reporting that Steam was soon comming to Linux ever since 2006. Just because Valve with the changes from Microsoft decided that they needed a backup plan six years later doesn't mean that Michael is a good source for news.
He's comparable to a gambler who by the Roulette table repeats the mantra "It will hit 12". Eventually he'll be right, but that doesn't make him a credible source when it comes to predicting what number the ball will hit.
And Blizzard have had a Linux client for WoW ever since alpha which testers were allowed to use up until the release of the game. But as we can see that client has yet to see the light again for the eight years that have passed after the games release.
Big companies like Valve and Blizzard have a ton of different projects that never see the light of day. In the case of Linux clients it's most likely because the man hours needed even to support them doesn't pay back in new customers.
He's comparable to a gambler who by the Roulette table repeats the mantra "It will hit 12". Eventually he'll be right, but that doesn't make him a credible source when it comes to predicting what number the ball will hit.