It is possible to use a bit of Anti-Skate on a VPI tonearm by twisting rotating the arm wire at its connection
There is a bit of Antiskate with no twist. Even one twist results in significant AS.
The best results I got with the VPI tonearm was with no wire twist and platter / armboard as level as possible.
The wire setup as an upside down U fashion results in a push outward - its just physics.
I have seen setups where the wire was visibly twisted. Based on my experiences this indicates that something may be out of level and the person is compensating with more or less twist.
Cheers