I don't read that as the MIF's controlling how many looks he should give a runner at second. I read that to say that by signal... the MIF's should let the pitcher know if they think the pitcher has a shot at getting this kid.
Your explanation could make sense in 12yo baseball, where there are a relatively large number of pick attempts to second base.
It doesn't make sense at the college level, where pick attempts to second base are rare.
Okay then I am with the OP then...why would MIF's control how often a pitcher looks at second???
It allows MIF'ers and pitcher to work better as a unit. It's a huge advantage to the ss and 2b to be able to consistently get a jump on their break back to their position. The pitcher could just as easily be the one to give the signs, but that's usually where the runner is looking.