Which is more likely, that the pdf has been hacked and seamlessly edited without showing any sign of it, or that leopold is lying?[/QUOTE
Actually, though it is pure speculation on my part, my hypothesis would be that Leopold got the idea 30 years ago, probably from creationist circles, that this conference somehow blew the theory of "macro" evolution out of the water and he has clung to it ever since without bothering to follow subsequent developments. He's somehow convinced himself over those 30 years that the report of the conference said what he felt it ought to have said. I've sometimes done a similar thing myself - it's just a sign of the imperfection of human memory, I think. Nowadays I have to be damned careful to re-check what I think I have known for years, as sometimes I find my memory has got twisted in some way and I risk making a fool of myself.
It seems to me the big lesson for creationists out of this is that science, unlike religious texts, moves on. It does not matter a damn whether you can find a text, somewhere, that seems to cast doubt on something. What matters is what has happened since and what the state of the art is today. Science is a live thing, not dependent on dusty scripts from history.