Why was it called Shinar? Because they die in choking (or degradation) without a lamp and without a bath (i.e., without the dignities of burial preparation).
On the daf / in context: The cited sugya explores why the region is called Shinar. This derashah does not describe the geography itself; it uses the name as an opportunity for an additional etymological reading connected with death without the ordinary care and dignity associated with a lamp and bathing.
Type of Learning
Custom (negative etymology of the land).
What Is Learned
An alternative reading associates Shinar with a form of death lacking the ordinary honors of care for the dead.