As expected, so called 'article' posted on this morning is nothing more than beer advertisement. Here is something that actually worth to look for.

From Steam Linux Thread:

Another independent confirmation:
At 53:06 Jono Bacon, Ubuntu community manager, says he knows that Canonical has been in touch with Valve to ensure that the client is well supported in Ubuntu.

This site is.... really laughable (I really did not want to say like this, but I think I should.) This short post from Steam forum has far more information than that 4-page 'article'.