The problem the author of the article is writing about is being so shy that you'll never be able to benefit from "practise" interviews. You should really consider whether or not you understand the problem before you attempt to solve it.
This is a big problem with hiring. So many people think hiring is a simple problem that has a simple solution, but you're dealing with humans. There's so much variety in the way people think and act that there won't be a generalized solution. For some, networking outside of interviews so you can get a recommendation is a valid approach.
I think you're confusing what works in theory vs the current state of affairs. At many companies if you speak of "you're dealing with humans" and "way people think and act" in a hiring process you're automatically inviting interpretations that can be used to justify the reason you didn't hire someone was because of discrimination. Simple as that.
If you really want to see change in the world stop preaching truth to believers, but instead root cause the problem and find solutions that address them. In this case, legislation.
This is a big problem with hiring. So many people think hiring is a simple problem that has a simple solution, but you're dealing with humans. There's so much variety in the way people think and act that there won't be a generalized solution. For some, networking outside of interviews so you can get a recommendation is a valid approach.