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i read a similar article a while back but basically this is what i have gone by.http://www.enginebasics.com/Engine%20Basics%20Root%20Folder/Reading%20Spark%20Plugs.html
This is a link to a short explanation of reading the ground strap for timing adjusting from E3. It's got the basic stuff as usual to skip through but reaffirms the difference in what your link says and what plug makers say. This is why I asked about what you know about plugs. What you posted is what I had always been told but now I know better.I found this more accurate info when researching e85 tuning stuff.https://www.hotrod.com/articles/spark-plug-reading-101-dont-leave-hp-table/