

I’d be cautious following simple commands and configs without explanation or knowing what they do. And when someone copies public keys via clipboard I’m skeptic. Use ssh-copy-id or at least scp. And with Hetzner you can add your public key to their panel and it will be automatically added to every installation.
As it is stated, this is just a journal / checklist for someone and made publicly available. Don’t blindly follow such things without understanding what you are doing.
It’s the public key so it’s not bad for security reasons. For me it just feels wrong to copy the content of a file to another using the clipboard. It can cause problems and one day you’ll do it out of habit with something you shouldn’t.