Actually, it's still true, but the wheels have been set in motion to make it less true over time. The Mac collection on Steam is still paltry compared to PC, particularly for AAA titles.
Well, you can still laugh at it if you wish. But considering that those paltry few games is a lot more than they had before, I'm willing to say the trend is changing. Somewhere there has to be a point where we can say "this is where it changed". I would think that the release of Steam is possibly that moment.