I don't really feel like Bronny James's story is relevant here- this was due to poor weather conditions, not any type of cardiac issue or lack of screening.
It seems likely to me. The article didn't say anything about them drowning or colliding with another swimmer.
As for the weather, I can't judge from a couple videos. I have some experience but not with an Ironman. What I do know is that race organizers typically don't cancel just because the weather is going to make a race significantly harder.
