With DVE you get the 100% bonus of Pusher AND you can collect whites, and you also have a significantly larger board. On a few songs, DVE should be able to compete with Pusher.
Since he also participates in radio songs, simple cheating is ruled out (actually I don't even know how to cheat on a radio song...). I think his scores are at the very upper limit of what is still possible, but, yeah, it's really close...
Decybel, please try to record a part of one of your runs. Fraps+half resolution @ 60fps or sth. might slow down your game so you make more mistakes, but it should still be ok to give us an idea of what you are actually doing, because I am really curious about how to play DVE.