Reece did not look good in that vlog, looked skinny and ill in the short footage of him training.

Is the heart issue confirmed? If so I would imagine they kept quiet not just for the medical reasons, but also because it is guaranteed to lead to conversation over vaccines etc and that is dodgy ground for everyone, especially professional athletes who make their money from sport and sponsors.

Edit. It did seem at first that she was suggesting mental stress contributed, but then she did add that she might have suffered some trauma in training.