Beach Swimming at CSS

I just noticed this on Trip Advisor:

"The sea is quite shallow, so swimming is not easy unless you venture beyond the area roped off for swimming and if you do you are likely to be called by the lifeguard."

My fiance and I were looking forward to lots of ocean swimming because our last trip was to Barbados and the ocean was too rough. We have our own snorkel gear and like to putter around and see what's under the water.

Can someone confirm if this is true? Can we not go beyond the ropes?