I'm confused as I see a calc, but is it for power or aim?
Now I'm on the JC Putting Method page the OP referred to....sheesh...what a complex read...
It's for aim, power still has to be thought out by your good self. Which is potentially a problem as some people trickle putts in, some whack the shorter ones. Given the methed described here is not going to be used on short putts though I could see it being OK for most people as even I don't whack long, bending putts in.
There are some unbelievably complex methods floating around. Some had you tracking the movement of the dots along the whole length of the putt, I hate to think how long a round using that method must have taken. Or what a night out with such a person would be like......
This is relatively simple but I can't see it working on putts that have multiple direction breaks or ones where the break becomes much more severe at the end.
It's a decent effort though. Not for me but each to their own and this does appear to work, based on my extensive, 1 hole analysis : ))