The Impossibleity Argument

The indispensableity, I guess, is something indispensable? That's really all you need to do. You don't need to philosophize too much about this in a way. If your theory also has math as part of it, you're adding numbers, then that comes along with the proof. But that makes me wonder about things like infinity. Does that mean that only numbers up to 10 to the 80 are real and indispensable? And numbers bigger than that, like infinity are not real or just parts of our mind?