I think about this often when discussing AI adoption with people. It's also relevant to this VS Code discussion which is tangential to the broader AI assisted development discussion. This post conflates tool proficiency with understanding. You can deeply understand Git's DAG model while never typing git reflog. Conversely, you can memorize every terminal command and still design terrible systems.
The scarce resource for most developers isn't "knows terminal commands" - it's "can reason about complex systems under uncertainty." If a tool frees up bandwidth for that, that's a net win. Not to throw shade at hyper efficient terminal users, I live in the terminal and recommend it, but it isn't going to make you a better programmer just by using it instead of an IDE for writing code. It isn't reasoning and understanding about complex systems that you gain from living in a terminal. You gain efficiency, flexibility, and nerd cred - all valuable, but none of them are systems thinking.
The auto-complete point in the post is particularly ironic given how critical it is for terminal users and that most vim users also rely heavily on auto-complete. Auto-complete does not limit your effectiveness, it's provably the opposite.