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Did you read the rest of the article? they theorize basically an extension of what you were getting at, that the failure was actually caused by an obstruction of the barrel (which is what the photos make it look like):

"There are a ton of folks out there who constantly load and unload the top round in their magazine, and then complain that the overall length is changing. In fact, such battery of the case neck can weaken it so much, that the shrinking tendency will rebound, and all of a sudden, the bullet is gone!

Where? Down the bore! The darn things pop out of the case upon chambering and fly down the bore to create an obstruction for the next round."