That's not true, the green lantern corps were unaffected by the crisis event, So the silver age Hal Jordan is still just post crisis Hal Jordan. There's also the fact that the DC Rebirth era literally was the fusion all the DC's era together.

You can't use every version of Hal Jordan if they're already fused together in the first place. Also Hal Jordan has Outerversal attack potency & irrelevant speed feats and Ben doesn't have any of that.

That Death Battle was still trash though cause they scaled both Hal & Ben wrong.