Super Dragon Balls flight is a neutral; not a positive or negative. It's never stated to have Dimensional Travel, nor is it stated to not have it. I know positives require more evidence, but I think secondary evidence can still be used. But Super Dragon Balls flying is neither evidence nor counter evidence and thus dependent on secondary topics.
But, we already have proof that Whis has dimensional travel via the dozens of face value scans brought up above and via
this post is face value evidence about U7 and U6 being different bodies of space. Which means if one travels via flight, it has to be dimensional flight. Just because there are no portals or teleportation doesn't mean it isn't dimensional travel and 4-D space flight is a thing. And if Super Dragon Balls can travel via flight, given it's a neutral statement where the positive half is dependent on secondary sources that are backed up, I think the logical conclusion is SDB also have dimensional travel/4D flight.