Breed standard calls for a promenent chest
"The chest is deep and full with prominent sternum showing clearly in front of the legs"
short rib cage is another matter "The rib structure is long, smooth, and extends well back. The ribs are well sprung, allowing adequate room for heart and lungs. Flatsidedness and flanged ribs are faults"
give that there is the same number of vertibrea unsupported by ribs I am sceptical that it is actual true but it is commonly proclamed having a basset with long rib cage and a coresponding short waist will be lesslikely to have back issues because the ribs help support the back the less unsupported distance the lower the risk for injury.
I would think that the number of vertibrea unsupported is a more important factor and that does not change.