I also don't think it is real, it is just that science kinda acts like it could be real. Any science experiment relies on the observers actually being observes, that the observer isn't the one that is experimented with, that e.g. your eyes do tell you something about the state of the universe, and that your thought process models the logic of the universe.
If there is total determinism, there is no guarantee, that measurement tape next to an object for one person shows 10cm, for a second 9.3cm and a third sees a unicorn.