filter.
Jon would have no reason to lie about what the Monolith is. The Eye is, for as much as I can understand it, a living Fear of sorts. Jon wound up becoming an avatar for... several of these Fears, touched by them at various points throughout his life, and ultimately became the main avatar of The Eye? Which if I'm remembering correctly is the one that's sort of in control of the whole attempting to take over the Earth thing back home.
The thing is, I'd have no way of confirming any of this without touching it myself. My connection to The Eye was severed when I died; if I touch it again, I'm back at square one with this shit.