When you get older and more advanced in your professional career, you will find out that books and papers are also biased, especially if they don't quote, cite references and provide explanations for their assumptions/conclusions.As a fellow history enjoyer and old D&D uncle, I completely agree with you. I've been playing D&D since it was called AD&D and I was also able to play the first edition once.
By the way, kids, don't rely on wikipedia or reddit to get any info for real. They are very biased.
As demonstrated above when examining the provided source, which readily disproves itself with a quoted passage.