This is true if events have an existence apart from maths. However, that is
still being debated. Tegmark's "mathematical universe hypothesis" suggests
that time and events are emergent from an underlying timeless mathematical
structure.

To take something that is (hopefully) less contentious, the block universe
of special relativity already suggests something similar to this. In
relativity, all chains of events are embedded in a space-time manifold, and
hence causation comes down to how world-lines are arranged within this
structure. Presumably the arrangement has abstract reasons (i.e. what we
call the laws of physics, whatever they turn out to be). So even in SR,
causality in effect takes a back seat, becoming the result of how observers
are embedded in a "timeless" structure. Of course in this case, time still
exists as a dimension, as it was in Newtonian physics. But even in
Newtonian physics, Laplace imagined the past and future would be "already
there" as far as a sufficiently godlike intellect was concerned.

So Newton and Einstein imagined that events were embedded in a physical
structure, but that they were "already there" in the sense of being
emergent from the laws of physics plus initial conditions.

ISTM that moving causation into a purely abstract realm is just one more
step in this process, and a logical one (though obviously one that needs to
be tested against reality).

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