Well yeah, the WWE is known for changing shit on the fly a lot, so of course there's no way for stuff to be completely accurate.
Meltzer, Alvarez, and PWI are trustworthy, and even then they all throw out that they're being told things by people, not that it's happening. The main issue is second hand sheets. Just as an example, the whole Punk returns thing with Melzter got turned into "Meltzer says Punk is 100% coming back" when what Meltzer actually said was pretty much "a source said he's 100% coming back but I don't think he is".