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But this is how crazy myths start, as someone will come along and repeat this same thing to other unknowing people.
Greyhound puppies sit on their own. They are just not reinforced to do it. Why? Because racing Greyhounds in general aren't obedience-trained or trick-trained. Some are and know sit! They exist. There just isn't a standard list of behaviors they need to pass to move on to the next stage of racing.
My dog has learned plenty of behaviors for his TKN then forgotten many from not practicing or using them regularly. Some adult Greyhounds sit on their own without prompting or cueing.
I don't know who started the myth. (I don't know who started the myth that Greyhounds can't swim.)
Even my XL male learned a sit for his trick dog titles, but since we stopped practicing it after those, he unlearned the cue. He unlearned a bunch of cues since that time.