Actually, David emailed me and asked me if I would be willing to review his plugin, and I agreed. I am also a plugin developer so I asked him if I could review his code, as well as review the functionality of the plugjn.
The code is clean, documented and it’s obvious these guys have developed WordPress plugins before. The functions are pluggable, so you can modify the functionality without having to touch the source code.
The plugin works well and my tests all validated with Google Search Console.
All in all, a great plugin. Thoroughly recommended.