The geography is the whole explanation and it is worth understanding rather than just being told.
Cozumel's reef — Palancar, Santa Rosa, Columbia, Paradise — lies off the west coast, in the sheltered channel between the island and the mainland. That reef absorbs wave energy, which is why the leeward beach clubs sit in water like a bath. The east coast has open Caribbean in front of it and nothing between the beach and several hundred miles of ocean.
The result is a steep beach profile with a heavy shore break, a strong undertow pulling off that face, and rip currents running through the gaps in the offshore rock. None of it looks especially dramatic from a table under a palapa, which is exactly the problem.
There are no lifeguards on the east coast of Cozumel. Not here, not at any of the bars, not anywhere. There is no rescue service standing by, and mobile signal along parts of this road is unreliable.
A small number of coves along this shore are genuinely sheltered enough to swim on a calm day, and the bar staff at each will tell you straight whether it is one of those days. Ask, and take the answer seriously — they have no incentive to lie and every reason not to.
Children should be treated as not swimming here at all. Photograph the surf from the dry sand.