Yes. We originally just put this together just as a primer for younger engineers to understand the basic steps. The guide you posted looks really good though. It looks like it covers some of the application side of things as well.
So many people get some of the most basic security wrong. It is great to see people trying to educate instead of just pointing out issues. Thanks for this work.
I love the fail2ban part of your guide! I totally need to try that.