Capulous on 28 December 2008
I believe it is based on sales numbers over a certain period of time. For the first Xbox, I believe it was 400k over a 9 month period. I do not know what the requirements are for the Xbox 360.
As for the two games you listed, I do not see them on the Platinum Hits list, where did you see listed as platinum?
http://www.xbox.com/en-US/games/platinumhits/default.htm
