No, it was on Microsoft's one. That I'm pretty sure of.http://www.officialplaystationmagazine.co.uk/2014/06/09/rise-of-the-tomb-raider-announced-e3-2014/
Yeah, it was announced during their conference. Which makes what happened today much more odd.
That does raise one interesting thing: It was able to leverage a rival's official channel to advertise their product. I guess it's not the first time, but usually cancellation on a platform becomes apparent well in advance because it's not doing so well (sideways glance at the Wii U).