As I already told you, Supes doesn't have a speed limit, he's always been as fast as necessary. Even Pre-Crisis Superman went so fast that Spectre had to intervene. Plus:
a) That wasn't an especially strong form of Superman that the Flash raced against.
b) Going intangible means Superman can't be touched, the molecules aren't there.
Batman's never even beaten Superman canonically. The former has only even been able to gain an advantage in a fight with help, lots of prep and/or kryptonite, but still never won.
Unrestricted Superman in his best form, Prime 1M, murderstomps unrestricted Flash in his best form, Wally West. You seem pretty noobish to DCVerse making comments like Batman can beat Superman.
" Supes doesn't have a speed limit, he's always been as fast as necessary" So then by your logic the Hulk can beat Superman right because he's described as being limitless, his anger can make him as strong as necessary and his radioactive body will allow him to mutate to survive any environment including space and the ocean floor. Not to mention, since you want to be all cannon with it, how many different times has Flash been shown to be faster than Superman in the comics? And conversely how many for Superman faster than Flash? Thought so.
Winning doesn't mean killing, Batman beat Superman in Dark Knight Returns he chose not to kill him though.
' The former has only even been able to gain an advantage in a fight with help, lots of prep and/or kryptonite," What does that have to do with the outcome, the result is still the same. People act like Kryptonite isn't a viable argument, give me 1 reason why the use of kryptonite would mean someone who beat superman really didn't.
"Unrestricted Superman in his best form, Prime 1M, murderstomps unrestricted Flash in his best form," Why are you so caught up on Superman as I said before this isn't about him or Batman or Wally, it's about Ollie and Barry.
"Even Pre-Crisis Superman went so fast that Spectre had to intervene" Comparing pre-crisis to post crisis seems legit.
"a) That wasn't an especially strong form of Superman that the Flash raced against." It was a typical Superman with no ridiculous power ups, get off it.