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I'd agree. Could be a worn belt, but there are a whole bunch of idler pulleys on the supercharger belt route.
I'm still not sure what's up with that service bulletin. It lists 2017 ZL1, but the main issue is related to AFM and noise when switching between modes. So that's a little odd. I just checked the belt on my 2018, and it's the same part number that came on the '17 models. So it doesn't look like a production change was made. What's also funny is that the Gates HD belt in that bulletin is longer than the stock belt. I'm not sure why. Usually that's the opposite of what you want to do to limit belt slip in a blower car.
That said, I decided to order a Gates RPM belt in the stock size. Why not? It should perform better and last longer than the stock belt. I figure having one in the garage isn't a bad idea.
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