Agree with Bewva and (strangely enough) Gordon, having just looked at the other travel trips websites etc, there is not a mention or condolence from them. So they may condemn C&T for nothing on their website yet I think they are thinking "There for the grace" etc...
I have been on many many boat trip and when living there sometimes 4 times a week and I honestly can not remember once a captain or staff saying don't swim on left/right, so if C&T did captain did say this to staff or tourist then good for them. however, staff often say in broken English careful and point to boats.
Also, if you look on your car insurance it states or used to, if you are involved in an accident you must not admit to fault or give an opinion as it could invalidate your claim.