Because if the references said "He used His Mighty Psuedopod" the audience wouldn't understand. Your citations are perfect examples of allegorical references.
God passed in front of Moses in Exodus 33. That doesn't sound so allegorical. Why should people be so bent out of shape about the thought that God would have a form that is similar to ours, or more correctly, that we should have a form that is similar to God's? Why should we presume that God has a different form of body or no body at all, if when He says in Scripture that He does?