Not true, snakes canphysically ingest far more than they are capableofdigesting. Result - regurgitation
As above. not entirely true.
It's worth monitoring him closely for the next 48 hours, if his previous meal is still showing as a bulge he may regurg. Keep an eye on him, and if it does happen bear in mind they then need time to recover before eating again, when snake regurgitate a meal they loose a lot of their gut flora, digestive chemicals etc and need timeto recover before eating again.