His opinion (as I interpret it--hard to get information out of him sometimes, he likes to sound mysterious so he's inclined to avoid answering questions directly and speak in koans instead, LOL!) was that it could be Yoga but it's inconclusive without more evidence about the distribution of that type of sitting posture and the meaning of the hand gestures. IMO there might be a stronger case if some of the other Olmec statues showing this type of seated figure display other hand postures that appear stylistic in a way similar to Yoga.