Of course the quantum wave function existed before.
I respectfully disagree,a quantum wave function does NOT exist—except in “virtual reality”—another clever word physicists use to avoid all that “metaphysical baggage” they worried about when quantum theory research began.
If the sun explodes it hasn’t until those with the power to observe and conceptualize (or translate)the wave into physical reality percieve the explosion some eight minutes after the “virtual fact” of the explosion.
“Virtual reality” some of us can sense it without such an event.
In a way,high energy physics has done more to buttress ID than any prophet—though atheistic physicists deny these most important ramifications of their findings.