All these are true:
- A happened before B
- B happened before A
- A & B happened at the exact same time
- Neither / there is no "before"/"after"
Considering this is the case with anything measured, what explanatory "truth" would be left when you consider a perfect description of reality? One that accounts for the global reference frames of every possible metric (not just order of events)?
There's no absolute "truth" to any of the mainstays:
Where things are
When they happened
In what order they happened
Even whether or not they happened (there is a perspective where all the values of a measured thing can be zero - like mirroring the velocity of a speeding object to reduce its speed to zero, or rotating a plane to make its height zero - and the different physical implications therein).
We correlate observed "locations in space" and the "passage of time" to heuristical approximations that work (as scientific theories) for our intents and purposes on a hyper local level (a tiny fraction of just our galaxy), but they break down on macro levels because they aren't really accurate descriptions of reality. Our physics doesn't work at scale - not smaller than atoms, nor larger than ~solar systems, without theories falling apart.
Space
The XYZ coordinate system we understand as "3D space" works great for locating and measuring the size of objects locally, we could perfectly track a tiny marble bouncing down a huge mountain with a granular enough XYZ coordinate system and telemetry. But that wouldn't work on larger scales like comparing the movement of subatomic particles with the movement of stars in the same graph. The graph couldn't accurately chart that without normalizing data or adjusting the reference frame toward one bias or the other (see scale invariance, vacuum catastrophe). We can only neatly slap a fixed reference frame over a scoped area, invent units and call it a "field", if we expect any predictive utility.
Time
There's not really an absolute "arrow of time" with a past and future, where A happened, then B happened, etc. in an absolute sense. As shown in the star example, it completely depends on the orientation and velocity of the observer, and other factors. No one perspective is more true than the other.
We all happen to hang out in the same frames, so it seems like some of these are rigid laws - they effectively are, for us - but they aren't really, ultimately. When you eliminate the heuristics that give value to science there's nothing left - which as mentioned above is a possible and potential state.