How seriously is Quantum Immortality taken?

On a scale from pseudoscience to Hard Science how seriously is Quantum Immortality taken by people who Quantum for a living?

Was mainly wondering because I see it being promoted by things like Kurzesgtat (I know I butchered that) and other popular Science promoters.

Yet anytime I see anyone, even Roger Penrose himself, supposit that mind is any way connected to Quantum phenomenon it is attacked mercilessly and rushed out of the room like a crazed bloodied up goat that somehow snuck into a nursery.

So I am a little confused. By what mechanism would Quantum Immortality even work if science is so sure there is nothing like a soul jumping timelines?