Unless he had this sense multiple times and was finally right this time...
Thinking of deaths of people I've known; dying at home in bed seems preferable to most.
"Being Mortal" by Atul Gawande is an excellent book on this subject.
https://www.pri.org/stories/2015-11-10/he-documented-his-own...
What does this mean?
Through this doesn't mean the Apple watch can't be a useful addition, just don't rely on it.
Except, when you wear additional bracelets at your both legs, the other hand, both shoulders and another 6 on your chest. Then yes ;). And consider the continuous cyborgization of our society, that is not that far away.
The 12 lead ECG is about detecting the electrical impulses of heart beats from different angles of your bodies.
If you found a technology to detect these mV values from a meter away ... tell me ;) We will be rich ;)
There's a reason ECG probes are attached to multiple points on the body, and you can infer quite a bit of info from just comparing multiple signals alone, including if you have your heart flipped, for some reason. :D You'll not get that from your watch.
They call this an electrocardiogram (ECG) but the one I had for a medical didn't have 12 leads just 5 or 7 I think.