As the article shows, it is a bug in iTerm2. cat is just one program that could trigger it, the key thing is outputting attacker controlled text to the terminal when the attacker can control what files are present (ie unzipping a folder that includes a specific executable file at a well chosen location that gets triggered to run when the readme is output to the terminal)

Give this one MS-DOS shell headline would be " why I never am using Microsoft again" or something dramatic like that.

It is a problem in iterm, Apple's overlay, not in the cat program. Program. At least from Reading the article. That's what I got