I don't agree with this article. I think DNS is something few people take the time to learn, but it's not actually hard to learn. One of the great things about DNS is that the system itself will tell you about it's internal state in response to queries. It's very easy to inspect a DNS server for a known zone and understand how it works, and there's very good tooling that's free and widely available to do this (like dig).
It's always been a big surprise to me that my DNS expertise is what seems to be most memorable for a lot of folks I've worked with through my career, when I don't believe I know anything mystical or special. DNS is extremely well standardized, the most common server and client implementations rigorously follow the standard, and it's very easy to inspect with free tooling. It just takes some effort and time to learn, but it's not really hard.
It's always been a big surprise to me that my DNS expertise is what seems to be most memorable for a lot of folks I've worked with through my career, when I don't believe I know anything mystical or special. DNS is extremely well standardized, the most common server and client implementations rigorously follow the standard, and it's very easy to inspect with free tooling. It just takes some effort and time to learn, but it's not really hard.