Also
@Endless Mike @Maddie I’d like to note that the version Post-Crisis Superman is fighting is Earth 2 Superman, the original Superman
It’s noted that although he started off not being that strong compared to your current typical Superman, he eventually grew in strength to the point that he could fight evenly with Silver Age “So Fast He Can Enter Heaven” Superman to the point they can double KO each other
However unlike Post-Crisis and Silver Age, Golden Age Superman gets weaker as he gets older, and in the next crossover it was noted he was weaker than Silver Age Superman and Captain Marvel due to age.
Then in Crisis it wasn’t especially noted he was weaker, although in a story just before that it was implied that Powergirl became stronger due to her and Silver Age Superman being summoned in the Bronze Age over Golden Age Superman.
So him fighting evenly with Post-Crisis Superman in Infinite Crisis and fucking with space and time might actually be a downgrade for Golden Age Superman in that sense, considering in his Prime he could trade blows with a Superman that could cancel out enough Green Lantern energy that merged/eliminated multiple timelines with the shockwaves of his punches.