He thinks it's the same engine as all the other Kias because they're all labeled with the same 1.6L of displacement. The Rio's Gamma engine is completely different from the Niro's Kappa engine, which uses the Atkinson cycle. Different bore, different stroke. (Kappa = 72 x 99 mm, Gamma = 77 x 85 mm) They aren't even the same displacement, 1.6L is an approximation, but they're actually 1579 cc (Kappa) versus 1591 cc (Gamma).
Bottom line, this guy didn't bother to do his research. That took me exactly 5 minutes to find all that data.