Incorrect, as has been shown empirically over tens of thousands of miles. I've saved several 700c tires from an early demise by gluing cuts shut. It's not hard. For frame of reference: R/C tires are glued to the rims with superglue, and those wheels can spin at several thousand RPM. I've made "hybrid" R/C tires by cutting two tires in half and gluing a left half and a right half together. Maybe you haven't used a decent cyanoacrylate in a long time, but with the proper adhesive (like MXBon 105) you could cut a bike tire in half and glue the ends back together.
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