He never said he changed shells - just that he uses zsh history. He was likely using zsh anyway.

My logic (take it or leave it) is that since zsh is not the default distro nearly anywhere (Kali?), a randomly selected person who might read that advice (and subsequent advice ITT), would likely find "Use ZSH" includes a shell change and therefore more learning curve than "add a few lines to .bashrc".

This is getting off topic, pedantic, and (maybe?) argumentative so I'm calling it quits. Cheers.