alright i guess it is an older issue...it is october 2001 and the article is way in the back, it is titled INVERTED 900 NUANCES ON THE INVERTED PIPE PROJECT.
they coment on 2 different types of inverted 9's, one being the d 9 where they use jon olsson as an example and even have a sequence of him doing it. the other type is the McTwist version and they use philou as an example.
here is a quote 'Most skiers choose to throw an inverted 900 in the pipe with dspin style, as Jon Olsson does in this photo sequence. He sets the trick by corking a 360 as he comes off the wall. Note the emphasis on throwing the downhill shoulder back toward the wall of the pipe.
By the end of the 360, Jon is inverted. Now he finishes with an off-axis flip, tailgrab in hand, and spins 180 to land.'
now here is a quote in the section about the mctwist version directly from jf cussons mouth.
'Philou does his 900 with a cork,' says Cusson. 'He spins forward, corks it, and his head goes a little beneath his body.'
note that he says a LITTLE beneath his body.
now you may be right that he does a mctwist 5 but i have never seen it so i dont know, but his 9's are dspin style.