I'm going to assume that you can edit .bashrc for these as that's the premise from the original article.

You could adjust it so that it uses a central notes store on one ssh host pretty easily with something like:

  notes() {
      echo $1 | ssh user@remotehost "cat >> ~/notes.md"
  }

then you probably need something like

  read_notes() {
      ssh user@remotehost "cat ~/notes.md" | more
  }