The article provides a very light history and technically shallow description of OAuth and OIDC so it can advertise Okta. Essentially, "these two protocols are complicated, and you probably don't care, so you should buy Okta." Except this is Hacker News, where caring is fundamental. I'll pass on the Okta advertisement.
This topic is near and dear to my heart because I've been working in this industry for many years now, and it is frustrating that there is a huge focus on building more OAuth/OIDC tools and encouraging developers to get directly involved in working with things like JWTs directly.
There are so many ways to mess things up at foundational levels today, I just really want to see better tooling created in the open source communities (and in paid products) to abstract things like OAuth/OIDC so that developers don't need to constantly be fiddling around with these lower level protocols where the risk for messing up is extremely high.