Maybe this indicates that zero tracking angle error is not the Holy Grail some claim it to be.
That's the designer's whole point, right?
You have to wonder how many people here who are poo-poo'ing the Viv arm have permanent tracking error built right into their cartridges and don't even know it. They could be listening with the same amount or even more distortion than what the Viv arm produces depending on how their cartridges were assembled and how good of a job they did aligning it.