Just ask the folks at GT Advanced Technology how easy it is to make high optical quality Sapphire in the production quantities needed by Apple. FYI They declared bankruptcy trying to do just that. You are correct, if they are growing Sapphire crystal ingots less than 6" in diameter, because the crystal structure is very susceptible to pull and cooling rate failures.
Has absolutely nothing to do with the sapphire in the apple watch. There's no way to conflate the two. All it does is plant an errant seed in the mind of the uninformed; colloquially speaking, it's FUD.
It still doesn't make synthetic sapphire rare. GTAT's debacle notwithstanding.
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