I'm well aware of this. I'm also aware that people are hacking these devices left and right. But a cow is a mammal and a mammal isn't a cow.
Gp post was not talking about security we're talking about Real time computing. If it's running on IoT hardware, eg rpi running linux, it's likely not doing real time os stuff because linux isn't really a real time os.
And I still don't classify pacemakers as IoT. Just because you want to slap a vague acyronym on any and every "connected" embedded device doesn't mean I agree.
There was an interesting talk at the Chaos Communications Congress a few years back.