I don't think Celan's point was "it was a fake so you would be tricked!", because that's a stupid argument. I think he's saying the report is spinning negative events into positives, in order to look better to the author's superiors. "It's okay boss, it was totally the plan, the project is still under budget and should be completed within the allotted timeframe," sorta thing.
it still contains the details of post "escape" direct Thalmor contact with him which runs contrary to everything the man supposedly represents.
there is in my assessment very little "spin" if any in that dossier. it's certainly not present in the language used which could be broken down sentence by sentence and shown to be pretty straightforwardly and factually presented with very little if any embellishment as one might expect from an internal government document but i really can't be bothered with these types of discussions as the only thing that really exists and is clear is the wish for it to be so by someone else on the other side of the argument (and i loath bullet point posting with a passion anyway)
i'm pretty much sure he'd get along great with garrosh hellscream

he will die in my current game one way or another. they all will.
i was born to rule and wear that crown by the will of Akatosh.