If you allow some self-promotion: you can take a look at the ansible playbook repo I've been putting up (including some documentation and background in the doc directory): https://github.com/pjan/the-ansibles

In all honesty; the steps in the TO's article are only providing basic security. Pointing the ansible playbooks to your server will further enhance it.

You should also consider changing the SSH port, but that's up to you (in which case you also need to change the firewall settings!)