So for $18 you get a tool that can bend a hanger, but does nothing to assess the amount and direction to which it needs to be bent back. Having used the Park alignment tool many times, I can say that it takes a bit of finesse to correctly align. I don't know how you can do it reliably without the feedback gotten through measurement.
I don't see the point. You'll be aligning by eye and it would be a rare lucky day that you would get it right.
It pains me to offer such a negative post, but it seems to me that this vendor should have put a bit more thought into the design of this tool. Simply adding a 10x1mm shoulder bolt of appropriate length would allow you to spin the handle around the wheel. Then you could measure the distance to the rim using a rule.