This article transitions abruptly from a discussion of different scientific models to one that is purely philosophical. In any case, to me, the business of science is the business of making predictions, accurate and repeatable ones.
In what sense does an “alternative reality” exist if we can never interact with it, directly or indirectly? If there is none, then the discussion is no more than opinion, dressed up as science.
An increasing number of scientists are starting to believe that after having done away with religion it is now about time to do away with philosophy.
However, there are questions that science will never answer such as: Why do science? What constitutes science? When is science being done? What is the purpose of science?
If in defining the scientific method scientists use the term 'observer' but then come up with a scientific theory that obliterates the observer, then they need to rethink their definitions, i.e. they need help from philosophers.