I think refining, sprouting and soaking all remove anti-nutrients, but according to Colpa, sprouting and soaking and fermenting do not remove all anti-nutrients and so refining maybe best. There isn’ really a way to remove the anti-nutrients from oats through refining them, so he recommends that if you want to eat oats you should soak them.
I haven’t read his book but from summaries I have read of it, I think that is what it boils down to.
I think that if someone enjoys sprouted grains though that they shouldn’t eliminate them entirely or be afraid of eating them. But if someone is eating them only because they are supposed to be healthier than refined grains, then they might as well as eat the refined versions since sprouting, etc.. don’t really make them healthier than refined.