Was the Golden Age Earth destroyed in the Crisis?
What most fans misunderstand is all the previous DC Earths/universe were destroyed and a
new amalgamated DC Earth/universe resulted from the Crisis. Earth-1 wasn't the new Earth as it was gone too. The DCU was rebooted from the Big Bang so the other Earths never existed in the revised timeline, only the one Earth.
The GA Earth may be considered surviving in the same sense as E-1 surviving as part of that composite timeline. Certainly, key elements of it survived like the JSA/All-Star Squadron and their involvement in WW2.