They weren’t praising God in that prayer. They are praising Anthony. So what does “anything is possible with God” have to do with it?
Why, when we praise a saint generally, it is God who put these works in the saint and the glory belongs to God. The gospel is filled with some people being praised and some condemned; an intelligent reader would know that when, for example, John the Baptist is praised (Matthew 11:11) God is ultimately being glorified.