Let me rephrase that: an afterlife is not guaranteed; therefore a breezy afterlife cannot be guaranteed.
None of us know what is going to happen when we die. There are many beliefs, but no guarantees.
The original statement was a reminder to think twice if you are contemplating suicide because whatever you think is going to happen after you die might not actually happen.
> None of us know what is going to happen when we die.
If you know the basics of the human body such as the brain, hormones, etc, I think it's pretty clear what will happen when you die. It's the same thing what happens to a computer when you shut it down. Do you know Occam's razor?
Anyone can believe what they want of course, but it won't impact reality.