Most of this stuff in my opinion stretches the definition of science.

"deduction based on observation and repeatable experimentation"

Quantum mechanics (for the most part) is pure math. Theory on paper. No experimentation and no observation.

Paralell universes might make mathmatical sense but until I observe one or have it tested empirically it's all speculation not proven.

Some "scientists" have turned themselves into a psuedo cult with dogma and faith based on not much at all.