We are just disagreeing here on basic interpretations of the wording. I think the writing is very vague and nebulous, very poorly defined. It doesn’t specify how much ‘finger’ needs to be under, so can it be just fingertips? I’d say yes if it doesn’t specify. They explicitly say that it doesn’t matter if the ball touches the ground as long as fingers touch underneath, it is so ridiculous, but that is what the umpires say. I’d also argue that ‘momentum’ would be more appropriate than ‘movement’. I’d say everyone that is fully capable is always in control of their own ‘movement’. If I were were fall off a ladder, I’d still be in control of my body own movements but not the momentum of gravity!
The problem isn’t that it is or isn’t a catch the problem is that the laws create the argument.