@rbreich first of all they increased revenue collections to the US Treasury, as predicted.
But secondly, what do you think a stock buyback is? It's a corporation giving up its money into the rest of the economy, which is what we want them to do in general anyway!
Stock buybacks are a good thing, as it represents a corporation taking money that it has that it can't use and giving it up for other people and other purposes to use as they need.
Including the US government.