There is no sources for the materials used to draw this chart in order to put back this chart result in context.
Because of this :
"Notes: The compatibility above is based on relationship satisfaction surveys as well as type compatibility."
And the following :
"Keep in mind, by its very name, this is meant to be a simplified chart for quick reference. Every relationship is
unique. A good match on this chart doesn't necessarily mean a good match in real life, nor does a bad match
mean an otherwise healthy relationship is doomed.
Do not rely solely on this chart for making decisions on existing relationships, whether romantic or in the
workplace. If you want to better understand a particular relationship, I strongly recommend reading deeper
on each of the two types before jumping to any conclusion."
This chart is fun to be used in a recreative way is my though on this compatibility chart.