Not just plausible. Greek artists startet to idealize their statues’ proportions and muscle size about a generation after they mastered the realistic depiction of their models. Statues from the classical period do not depict how their models acually looked, and the vast majority of antique statues produces afterwards are just copies of works from this period.
There might be merit to the theory that ancient greeks, romans and their contemporaries had higher t levels, but their statues won’t really tell you anything about that,
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