>And how do most of these "personal details" actually have anything to do with his credibility?

The parent's second paragraph addresses that. He may have misinterpreted or not have understood what he was looking at. As the above noted, some of his remarks already seem questionable.

>rubber-stamping by the FISA courts

Sorry to go slightly off-topic, but what is the evidence that the FISA courts are rubber stamps rather than really doing their job? I'm not being snarky, I just haven't seen any (but I have heard FISA called that a lot)