It's not clear why you think this article strengthens OpenWrt, or why we would have some updated formula for it. That article doesn't appear to be in the official OpenWrt Wiki.
The article mentioned BanIP (but I think it's a script to ban scanners, more on that below) - this is an available package in OpenWrt and no fancy scripts from an 3rd party article needed. See: banIP support thread
Lastly, the article mentioned banning scanners - but by default, OpenWrt's firewall blocks unsolicited traffic on WAN anyway. You can also turn off things like ping, etc. without fancy scripts.