It's true and he adds quite a bit on his leaks, but he reviewed N900 with pics before we had even really seen the device, knew that Nokia does not have booth in MWC before MWC own page reported it, was the first to report that N8 will get delayed and he has been leaking stuff over at MR years before Engadget started quoting him.

I do most of the time believe the main points of the rumours he posts, but usually his reasonings, reviews and his everyday twitter posts are something different. Just get the main point and ignore the rest.
Example the reason that Nokia does not have booth in MWC was because if Nokia did not have money for it according to him... enough said.

Lets say N9 is scrapped he did not say exactly what was scrapped was it RM-680 or something else. So as a whole this isn't really revealing too much. Like he said there's still of course N9 coming.