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He is not telling you straight. If there is a major warranty claim that they suspect was caused by a tune they then will go through the process to read the flash count to see. otherwise it is an extra step that takes time & cost them $$ they don't want to spend.
All hand held tuners I know of allow you to flash back to stock if you choose, and for a custom tune most save your stock file & can flash it to stock if you choose.
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