I don't think you guys are really taking into account how potent Joe's time slow is. None of you have discussed how Goku is able to do anything given that Joe will likely start off with slow. None of you have discussed how literally everything Goku does will be slowed down to the point where, from Joe's point of view, he'll be practically frozen in time, where Joe can rip out his insides. Goku wouldn't even be able to put the mines out because he'd be too slow. And Goku, as shown through the tournament, tends to only really use his head against stronger opponents. Not that Goku is stupid when it comes to fighting. No, the man is fantastic. But he didn't even take having his own universe potentially erased seriously, and only really started fighting seriously once Jiren started destroying him. This doesn't add much to the argument, just something interesting to point out. He rarely starts off with his best tactics first. (Destructo-Disk, mines, solar flare, kaioken, etc.) Instead, opting for hand to hand, or a ki blast. Joe goes for slow the most. Thusly, when the match starts, Goku would likely charge in, and time would slow to the point where Goku is almost frozen. And the Joe can proceed to pull out his insides. Goku does not possess a counter to this. And seeing as how Joe's time slow affects time and not speed directly, it is permitted in a speed equalized match. Just to clarify. It's no different from anyone else like Sonic or Dante, slowing down time.