This is from the agreement near the top:
"The actual license is available through the hyperlinks below, and if you’re comfortable with legalese (or somehow actually enjoy reading legalese) feel free to jump ahead to those links."
"The preceding material is not part of the OGL 1.1. To access the subdivision of OGL 1.1 that applies to your use of SRD content, click below: OGL 1.1: Non-Commercial OGL 1.1: Commercial OGL 1.1: Non-Commercial"
Then then get more text with clearly marked COMMENTS section. The part they explain is the "We’ve included explanations and examples alongside the legal language to help make the OGL easier to understand and comply with."
What do you mean sources would have mentioned it - leakers mention all the time the agreement, but this is the only source that actually provided a PDF copy of it, and we don't have THEIR comment on it at all. Nobody I know of has said "Yes this PDF is the entire license". Not once that I've seen. Have you seen that? There is no conspiracy - I don't even think anyone has been handed this particular document exactly and asked if this is a commentary that came with the license or the license text itself. I do know of one source that said it's the commentary which came with links to the actual licenses however.
Of course the receiver needs to press the links. There isn't even a set of signature lines at the end! You literally cannot agree to this agreement, so far, from the text we have in that PDF.
I am not saying this is fake - this is not fake at all. I am saying this isn't the full license text but is instead a layman's document included with the licenses in some fashion.