All recommendations Tesla give is for both NCA and NMC/A for those cars, and it also covers all over the world at all different climate and temperatures.
They all make sense against the research, if you read them as they are stated and not add own interpretations to the advices.
Remember when Tesla says '80%' they say 'up to 80%', not at 80%. So 50%, like how a few of us do here, is within Tesla's recommendations.