One of the more worthless things that's often posted on here, not merely due to their use of imaginary oil grades.
Lots of marketing by Driven in that chart. Marketing to a specific segment in fact.
Take yourself out of the mindset of a BITOGer. Twice just last week, I had to correct someone who thought the first number of a multi-grade was the actual grade. Both of them swore up and down that an SAE 30 was more viscous than a 20W-50 and thought the "W" stood for weight. The sad part, one of them is an ASE certified mechanic. The chart forces them to look at the 2nd number and not blindly follow the first. Those oil grades are commercially available as such, regardless of J300.
That chart is made with a lot of dumbing down which to us, makes it look kinda silly. It's also not a cut and clear guide, merely a starting point for someone who doesn't know where to look with a new build. Different engines of different bearing widths, crank stability, rpm, and load (plus other factors) will change that.