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???
If you don't do this, at least at HS and below, the runner on second can pick up the pitcher's timing and use it to steal or at least get a better lead. Having the SS or 2nd baseman give the pitcher a sign for number of look allows the infielders to anticipate the pitch, and gives the pitcher one less thing to worry about.
As to the OP, do college teams do it the same way? I don't know. But why wouldn't you do it?