Hey Joe.
It all depends on what you consider to be a variation. For many, including me, a true variation is when something was purposefully changed before the subsequent printing. In other words, a distinct and purposeful difference between the two versions of the card (such as white letters, trade options, misspellings, etc.). There are other ones that aren't necessarily a result of that (the 1966 #432 'purple tree' Heffner comes to mind), but as other people here have said, some printing anomalies attain prominence in the collecting world and become de facto variations.
The Yaz you show is such a printing anomaly, the type that occurs all the time in the printing world. And the sharks on ebay try to turn everything into a 'new' variation to get people bidding. I block most of the shysters from my searches, because it just gets so ridiculous as they try to insult everyone's intelligence.
The flip side, of course, is the collector who collects every anomaly they can get their hands on. Whatever floats your boat, I guess.
--elm
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