Worthy Clerks?

"This is attested by truthful accounts about him and much dependable intelligence recorded by worthy clerks about his many deeds..." (Kalinke, pg. 225)

I chose this quote because I find it interesting that the author here is stating that many of King Arthur's deeds written on are truthful accounts.  The entire premise of our class is whether or not Arthur was a true person but right here the author clearly states that he was.  I find it curious because these "truthful accounts" are many times absolutely absurd and filled with exaggeration, but at the same time the author of whatever it is almost always says that they were an eye-witness.  This sentence also follows an entire paragraph on how Arthur was the literal perfect human being in every possible aspect...