Yes I see that Roush swapped to a press on pulley on the 09-10 M90. The press on pulley looks like the GT500 pulley and does not have a nut holding the pulley on.
The one in your picture is a bolt on pulley. Use an impact wrench to remove the nut and you'll probably need a puller to pull the pulley loose as it's likely stuck.
I thought it was a keyed pulley as well but when I called roush and gave them the part number on the pulley they said it was a press on. That's why I put it up on svt, I wanted to confirm what they told me.