J Dunn, I think VF is incredible! I'm a big fan of him as an athlete. I've actually had several conversations with him online in the past and we've had a lot of good thing to say about the other, in short I think he's one of the greatest GS lifters of all time and I LOVE his videos!
All that being said, when it comes to the press, if you look at the above video you'll see, on every single rep, some more pronounced than others, the knee opposite to the pressing arm definitely bends a tad prior to every press and straightens out as he presses. He is getting SOME leg into the start to initiate the press, which is significant.
I'm 10-15kg lighter than Valery and when I pressed the 60kg barbell here it was 80% of my body weight and seven feet in length, if i hadnt have positioned myself under the middle of it by leaning I would've toppled over to one side due to physics, plus . . . well yes, you can lift more weight that way, but my arm doesnt lockout whilst my body is still bent (like the capital letter L) instead, my body straightens with my arm, so its not a pure side press by any means. But there was ZERO knee kick.
http://www.youtube.com/watch?v=53xkueVW5mE
But this is NOT meant as a put down of VF! Some of the things he's done are without equal on the face of this planet!!!!