Well, as far as I know, Joe Dever has the rights to those monsters and descriptions. He has given permission to only ProjectAon to publish his material publically. The names and text descriptions of each creature in question are his domain. I don't think Mongoose has any actual right to that information. I'm not sure if Joe Dever would even mind these creations using his text, especially since it is readily available for free from ProjectAon.
Additionally, the monster stats are all based on OGL rules, which Mongoose does not own. Meaning you can stat anything out that you want, as long as you don't include any text from the Mongoose books that aren't basic OGL content and that aren't specifically taken from the LW books (since that's up to Joe to decide, not Mongoose).
I can't see any reason why publishing a .pdf with all of this information publically with Joe Dever's consent (if it can be obtained) would be any of Mongoose's business. I don't see how they could give consent for it in the first place--they don't own rights to any of the stuff that you guys have published here on these forums.
Heck, it's already all been published publically here in this forum anyway, what difference does it make if someone compiles it so it looks nice?