I don't take Fred Picker's word for everything. I use Ilford Galerie for example, and he hated that paper.
But I think it is wrong to use the Macbeth color reference to debunk Fred Picker's claims. Particularly because he claimed to have improved the correlation between meter and film in the infrared region. You know that chart wasn't designed to do that.
I try to consider any effect that only causes a 10% error trivial enough to ignore. But Fred was showing that Soligor Spot Sensor II made a 2 stop error in several cases. That caught my attention.