Atheon cannot be tracked in the same fashion as Broly. Remember how hard it was for them to find and defeat the androids? They gave off no power signature. Broly radiated energy at pretty much all times after he killed his dad. And I'm not denying goku can go between realms (which is still different from time travel, goku doesn't have the same travel ability as Dr who's TARDIS) but in dragon ball z there's only 3 or 4 that are mentioned in comparison to an infinite number of instances in time inside the vault of glass, plus like I said goku wouldn't know where he is and or where he needed to go to even think about teleporting back on his own.
But even if through some stupid low probability that he was able to teleport back, did he bring the relic? No? Did he kill the oracles? Hm. Looks like hes blind and well on his way to being lost in time.
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Don't the vex give off energy? I thought that's how we found them
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Yeah but it seemed like more of a jump signature. Like in the movie jumper, they had machines to show them the rips. Here the exo stranger and the ghost did most of the tracking for us.
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You don't think goku would notice even a jump signature?
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He would notice the sudden disappearance and reappearance for sure, they leave a trail that shows which direction they went after all. The thing is they only teleport to you, no one really questions where they are coming from or where they are actually trying to go. Goku would probably look at it and assume it's a lower grade version of instant transmission with a significantly shorter range when he saw the lower downs of the vex do it, but should he be forced to teleport at random he wouldn't know which way was really out or that he was trapped in the first place. He might assume he's just in the bosses world and wait for atheon to also teleport to him to finish the fight. The vault of glass is almost like a grand scale inception. If he gets teleported to the past or future on mars and he does find a way to teleport back to Venus it would be the same time as mars. For Venus he would teleport back to the original position possibly to find out the the vault isn't there or doesn't look remotley close to the same. Worst yet he could teleport and have his ability be tampered with because he isn't travelling through standard slip space anymore and he could end up flinging himself further in the past or future. Top that off with everywhere he goes may or may not exist with a side of infinitely confined multiverse and you have a very lost and blind ssgss.