The breathing will always sound like this when you starve your brain of oxygen…. Which is what SN does, it restricts oxygen from your red blood cells. It's not going to be an instant lights out, there is going to be vomiting while your body tries to fight the poison, there is going to be agonistic breathing, there is going to be involuntary movements.
He was unconscious very quickly and from the time line, he passed very quickly. 30mins from SN to silence - I think this is an absolute dream, especially when you compare it to other methods.
I don't think anything about his timeline screamed discomfort or pain. It appears extremely peaceful and I believe fully he had the passing he desired and deserved.
Let's not turn his timeline into scaremongering, that's not why it was posted and it most definitely doesn't read that way to most of us.
If you are concerned, read the SN mega thread about preparation to prevent as much as possible.
I have AEs. I will get benzos….