The last failure in flight was 2015. Since then there were 120 successful launches and no failures. There was one payload lost in 2016 during a static fire test.
In terms of rocket launches Wikipedia is very good. I certainty don't know about a better source. Maybe SpaceX has a list public somewhere but I would not sure that is as up to date and detailed as Wikipedia.
Real question: Do you think that Space X (PR) employees primarily manage that Wiki page? It seems possible. No, I don't think that is weird or sinister. All of it could probably be verified with an afternoon of YouTube searches! It seems like something that Elon Musk and Gwynne Shotwell would publicly discuss / support. Both are quite intellectually direct in their public media appearances (less b/s than most corps).
I don't think so. Wikipeida is really good at all other rocket launches too. Pretty much all rockets at least in the West that I have looked up are very up to date.
The information of all that is public and the people who maintain those pages are one it. Maybe they have even atomized it.
