This showed up on Reddit in a few places too. I never heard anything about a heart attack at the time, in fact you can see the driver holding the brakes after that first spin... The articles I saw all claimed that both drivers were fine.
This was during the burnout stage which is why the other car was stopped. The kill switch had allegedly malfunctioned after the throttle stuck open. The facebook source has been removed, but here's a few of the posts I saw
https://jalopnik.com/watch-a-drag-racer-with-a-stuck-throttle-go-the-wrong-w-1832331193