I'd ignore that advice. Reminds me of this:
Maybe for suede though...
This happened to me, called Wolverine customer service, they saw pictures and agreed it was more than usual. Told me to send 'em back to the seller (Crane's) and Crane sent me a new pair. After a bit, still had a tiny split, so went to a cobbler and they used a couple more nails to keep it down. Cobbler said wasn't a big deal, Wolverine just nailed the heel too far in. Still a tiny bit of separation (literally barely enough for a piece of paper) but all good now. I wouldn't worry too much.
Sorry I haven't been able to read all the posts in this thread, but has anyone experienced this kind of issue with their boots? It seems like the coloring/leather on my shoe is rubbing off. Anyway to fix or remedy this? I've only had these boots for roughly 1 month.