This links says its for Gold Members.

I am currently PLAT but was unable to travel this year due to recession. Now that I am travelling at end of year... I am thinking of maximizing the return to retain my status. I love SPG and am very loyal customer.

I have closeby Le Meridian to my Sheraton and I am thinking of going their one night in order to get 3 stays and qualify back for PLAT. @:-)

This economy has caused me to loose many of my status(es) everywhere