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A couple of thoughts:
It is not uncommon for many tire shop techs to misdiagnose irregular wear as a separation. They frequently use the phrase "Slipped Belt" to describe the condition - a phrase that no self respecting tire forensic analyst uses because it doesn't describe the condition accurately.
I had a tread separation once, caused by a cut through the top belt. I first noticed a vibration and 300 miles later, it let loose. Luckily only a chunk of the tread (and top belt) came off and I was able to pull safely to the side of the road and change the tire.
Further, the belt wires were protruding, so when I felt for the bulge, I cut my hand - lesson learned!
This experience is consistent with what I know about how these failures progress and the extensive testing conducted by the company I worked for specifically designed to fail tires in this manner. It would be extremely uncommon for a tire with a tread separation to last several thousand miles before a catastrophic failure.
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