People don't believe you Michael because there has been no official word.
People don't trust you about it because you have been completely disingenuous. You said it was OFFICIAL that Steam was coming to Linux, but it has never been confirmed as official. You have lost a lot of good will over the Steam issue and your attitude that anyone who doesn't believe you is just a hater or a naysayer borders on religious fanaticism. People aren't going to believe you just because you say something. If you say something it official, there better be evidence. If you had any journalistic principles you would understand this.
You should seriously draw a line under this issue and stop talking about it until you actually have news to report.
Even if Steam was released on Linux tomorrow, your original article would STILL be factually wrong. You were wrong. Get over it.