Sony changed the button combo as a result of the video that was made by math and rms. I'm sure that the video was released after 3.60 and as a result they updated the combo.
The video was released like a week or 2 after 3.60 came out, and I was thinking the same thing also.
Edit: gitbrew @ matmen12 we have the keys for 3.55 and lower, they fixed the exploit in 3.56 with their keys. so we can't sign the new tokens / flag. Well isn't that a bummer.