Um, this doesn't prove reality doesn't exist until it is measured. It just proves that measuring and "decision" which state to appear in happens simultaneously.
It could mean that time on quantum scale doesn't differentiate past/future.
Sure it does because, while certainly quantum scale doesn't carry the same sense of time, we do.
Everything we see, what we call reality, is made up of the Lego blocks of electrons, protons and neutrons, and yet even at that level it makes no sense to talk in concrete terms about, say, an electron's spin. We would expect that the spin exists and we find out what it is when we measure it, but it's not that. It's that talking about its spin is meaningless until you measure it. What you can reason about the Lego blocks of everything we see, smell, touch and taste, what gave birth to us and what will kill us, is indescribable until it's asked to be described. Whether that's because it's locked-in to time or not is irrelevant because it means the same thing: reality is not there until it's there.
You can only conclude that "Physical reality doesn't exist until observed", if you imply nothing can move faster than light.
Also hidden variable theory aren't yet categorically disproven. A fractal theory could explain why we keep getting different results when measuring reality in different ways.
I will happily imply that energy/mass cannot move faster than light.
You know, I think a hidden variable theory is a crutch. To me, there's simply a Planck's constant foundation that prevents infinite regression just as much in terms of information as it does with radiation, etc.
If you're measuring N-S electron spin, you will get 100% N spin or 100% S spin but never any E-W spin. Period. If you're measuring E-W electron spin, you will get 100% E spin or 100% W spin, but never any N-S spin. You can word smith it how you wish, but electron spin is directly tied to the spin you look at. To speak of the "reality" of the spin when you're not measuring it makes no sense.
In my previous comment I didn't mention relativity.
> If you're measuring N-S electron spin, you will get 100% N spin or 100% S spin but never any E-W spin.
Ok, but not arguing against it. I'm arguing that there are alternative interpretation to that event other than "reality doesn't exist until we look at it". There are other explanations like: retroactive causality, many world, informational based, etc.
Basically, just read the top comment, it summarizes my thoughts on the matter.
It could mean that time on quantum scale doesn't differentiate past/future.