Yet, and I'm specifically referring to Kirkbride's texts, there are quite a few texts added much later, after the lore had already been shaped and MK was no longer employed by Beth.
But the lore had been shaped before he stopped working there, that's why we tend to accept them as, if not truth, as lore.
Interesting, I've never seen that quote before. Source?
It was on the twitter. There was that guy who was trying to disprove the lore texts he didn't like, and he asked Pete four questions which were answered chronologically, it was really quite humorous when he tried to rearrange the answers to make it look like pete said they were non-canon not realizing I, too, follow Pete on the twitter. But since this happened way before Skyrim I think it may have disintegrated into the ether of the twitter by now.