What facts are wrong? There was a user Aussiedroid stating the same thing:
"I've perhaps spent 8 hours over 2 days on the mission, puzzle & prep, and have yet to unlock a module. I'm sure I am not min-maxing the puzzle & site, and I am collecting a lot of other guardian stuff, but those blueprint stall the whole process! Makes it much longer than it should be IMO."
I had the same experience, only left a small amount Guardian segments i think.
So, back to the questions:
Can you unlock more than 1 blueprint in one site? How?
How many sites are there and how many blueprints?
Oddly enough the "facts" I pointed out as being wrong are the ones that are in fact wrong.