I don't think he is lying, because the situation is probably that there is no capital-T Truth, just a lot of stories that are true from everyone's perspective.
Just that, before I can really comment on the situation beyond asking questions or picking at things that I want further explained, I would want more information.
For example, for the two weeks notice thing? Generally even contractors I have hired give that courtesy; but the situation could be such that this wasn't a "declaring notice" thing. It could be that the allocated hours completed, and Monte didn't want to re-up, or it could be that WotC was way behind on payments, or it could even be that they were collapsing roles and Monte chose to step away from what he felt was a negative situation so that somebody else could keep their job.
Both of those would match what Monte describes, but they imply different things about what is going on behind the scenes.
So, yes, if I were being pushed to comment or to decide how I felt about the situation, I would need another source or more information.