Sounds like he is afraid it will be full of utter shit and not want to smear the poor guy anymore than has already been done.
Actually, it sounds more like it has damning evidence in it showing why Kavanaugh shouldn't be a SC justice. If it is helpful towards getting Kavanaugh confirmed, they would have already released it.
No, it doesn't. It sounds like it could be full of utterly unreliable and/or personal shit that has zero relevance.
That is your opinion, based on your political views. You don't know what is in it, so you are automatically assuming it is against Kavanaugh, but if it was favorable or unbiased, it would be in favor of Kavanaugh, and therefore should be released to get the rest of America to get behind Kavanaugh.