I have read the 2002 appeal and I think they're wrong. I don't know what you mean about the page being folded - can't you draw it? Jeremy hasn't promoted the idea that it is Sheila's palm print - you won't find it on the OS.
My brother got all the art skills he won a painting contest in school and can build just about anything- I draw stick figures my artistic skills are nonexistent.
Picture a curved wave like this:
Pretend that the other half of the water under the wave is the other half of the book. Now flip the wave upside down to the crest of the wave touches the floor.
That is what a book folded over looks like.
Do you see the upside down "wave"?

very little of the right side (left side when you look at it face side up) is touching the ground only the end of the pages. A good portion of the wave is touching the floor though specifically where the stain on the page is was touching the ground.
If that stain could surely be attributed to a hand covered by a bloody glove then the prosecution would have raised such. Some suggest that is the case but nothing credible has been put forth to establish such as opposed to simply it sitting in the stain.
I commonly hear claims that there were bloody fingerprints but that is not true and the bloody palm print claims are likewise unsupported by any reliable evidence.