The linked article actually mentions that ("there are people with title 'senior' that can't do fizzbuzz"). So the fact that some "senior network engineers" did

The linked article actually mentions that ("there are people with title 'senior' that can't do fizzbuzz"). So the fact that some "senior network engineers" did something stupid doesn't prove your point or invalidate the article in any way. There's a big difference between not having experience with the <framework_du_jour>, and not knowing foundational technologies. E.g. there's a good chance Jeff Dean doesn't have much experience with most of AWS technologies, but there's no reason to believe it would take him more than a few weeks to get up-to-speed with them if he'd really need to. Not on the "expert" level, mind you - but enough to not make big mistakes.