Yes, I'm aware of that, thankyou. But the post you've linked there is from over a year ago and, as you say, a previous version of LE, and says exactly what I've stated above ie:
1. There is something there that looks like watchdog
2. It doesn't seem to be set up and working
As I said, the config files that would normally be there for watchdog (setting heartbeat interval etc) are missing, and there's no way to interact with the "service" to probe it. I know it works fine on other Raspberry Pi OSs, hence why I'm asking if anyone knows of a way to make it work on LE or whether it is likely to be reactivated/given some attention in a future version.