that stealth kayak is designed for big water fishing, lots of great open ocean fishing are done on steath kayks, you can find them on youtube. According to his friends, he's usually very well prepared for the waters he was fishing, most likely he had a medical condition, but we'll need to wait for 3 months for the autopsy result
https://www.youtube.com/watch?v=2YXsB4TvdSY