It sounds like you consider this document good evidence because it already aligns with what you believe in and not on the merits of how the information was gathered, how it was verified or any sort of other merits you'd usually evaluate such information when you want to use it as evidence.
And I don't think CIA was sloppy. But this again hasn't been even evalued by them, as it says on big bold letters right at the start. We have no idea what CIA actually thought of this document since we have basically no info on it. Sorry to say.