No! It's bases on statistical analysis. Here is a video explanation of xG which is what was used for the Expected Points calculations that provided the data set for the graph in the OP.
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Nope, this graph is not based on opinion or fixtures but on statistical analysis based on xG. This was posted above, but incase you missed the explanation:
Expected points are calculated through expected goals, another advanced metric that’s made its way around the game in recent years, and has...
Apologies if fixtures, but found this graph plotting Expected Points* against Actual Points.
You can look it it with a glass half empty or glass half full approach I suppose. It does underline the fact that we create very few chances in games which you'd think, in terms of points, would even...