I’d agree Vader was a sith but not really sithy if you know what I mean compared to the old republic sith or even Sidious.
Luke how ever Is in no way a master Jedi by any standers. He spent like what half a year training in a swamp? If even that. Jedi spends years trading before they get to knight let alone master Luke is only a Jedi because all the real Jedi are dead. He didn’t even read the old Jedi books I doudt he knows the difference between a sith or any one using the dark side.
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Palpatine gives litteraly every one the name Darth, I always saw it that he had planed to train him but gave up on that when he lost his limbs. Instead he used Vader as a tool rather then teach him.
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Do they really not call them sith? I must have never noticed.