No because there's a shit ton of people who could still punch him to death, plus there's a shit ton of magic users, from Doctor Doom to Loki to Doctor Voodoo to Scarlet Witch to Illanya Rasputin.
Then you have people like Magneto and Polaris who can use their control over the EM spectrum to prevent Superman from absorbing solar energy. Then you have types like Silver Surfer and Spectrum who could rob him of his solar reserve outright. Then you have the types like Hyperion, Gladiator, and the Sentry who could actively have a slugfest with him until both sides are completely exhausted.
Then you have people like Thanos who's fought entire teams of Superman-tier individuals and has come out as a victor.
Superman is far from the catch all "everyone loses to him" character in comics and is nowhere near as OP as people make him out to be. This isn't the Superfriends or 1965-1975.
Even factoring the Flash, there's characters that can keep up with him based on how fast he is moving. Northstar is faster than light, so a casual Flash is going to have to work harder against him than he would against Quicksilver, Silver Surfer is stupid fast too, plus all the pre-cogs and telepaths who could shut him down before he goes into the "I'm gonna outrun existence" speeds, which he won't just rush into if he doesn't think he needs to reach those speeds.