Ummm... It doesn't matter what it actually is, it matters whats legal. "Neck cranks with chokes" are legal in almost everything as are "shoulder locks with some head/neck pressure". This should be a legal omaplata finish and I almost always get shoulder with it if my opponent doesn't freak out and crank there self weird. But it depends on the reff, I've seen so many electric chairs called heel hooks...
Short answer: In adult beginner under IBJJF based rule sets, I've seen this typically allowed by the reff...
Kids, if its a rule set where its "no pulling the head on a triangle", another words, if they are worried about neck cranks inside other moves which is generally exclusive to kids, you probably will get a warning if their head is pulled back at all... But it all depends on the ref.
P.S. The more you have the grip down by the chin (low) and pull yourself up, the more its gonna be in the shoulder and the less likely the reff will care no matter what it is. This is all just based on my experience of what reffs typically do though.
Short answer: In adult beginner under IBJJF based rule sets, I've seen this typically allowed by the reff...
Kids, if its a rule set where its "no pulling the head on a triangle", another words, if they are worried about neck cranks inside other moves which is generally exclusive to kids, you probably will get a warning if their head is pulled back at all... But it all depends on the ref.
P.S. The more you have the grip down by the chin (low) and pull yourself up, the more its gonna be in the shoulder and the less likely the reff will care no matter what it is. This is all just based on my experience of what reffs typically do though.