Another hint: Chris Siebenmann's posts to comp.unix.wizards can still be found.
If you quote only half of the sentence, it suddenly means something else! When used to attack it’s a variation of the venerable ‘straw man’ debate technique.
Nice if Mr Siebenmann made insightful comments on a Usenet group about Unix but that doesn’t mean his comments about ARM computers are indisputable.
How about you summarize the points in the blog post that you agree with?
What the author wrote objectively demonstrates a lack of essential skills and also a lack of temperament for what could be called a sys-admin, and therefore they are ultimately disqualified.