I have asked twice, but since you have not named other sources of information I am going to infer you don't know any. You are suggesting only the obvious--that we don't "rely" on Internet forums as our sole source of information about scooters in Cozumel--and that doesn't seem helpful to me. I wouldn't rely on Internet forums as my sole source of information about ANY topic, and I doubt others here do either.Certainly look into records with Cozumel. They might not be complete, but would be much better than speculating on the internet. If you are unable to research accurate information then I would suggest not commenting.
Thank you, @lionfish-eater and @ggunn for pointing to poresto.net articles. I recall having seen other discussions in which articles from Por Esto were posted. I probably should make a habit of reading Por Esto now and then. I'm more of a mainland visitor these days than Coz, but Por Esto seems to cover the wider region.