Addressed
here.
ig it is a bit weird as far as teleportation goes. They leave mists behind, and there's sometimes a delay between when they disappear/appear, and at other times a faded visual of them remains when they disappear, while they're still reappearing somewhere else. But I still think the greater preponderance of evidence goes against you.
If your teleportation does leave marks like that, it makes sense to repeatedly teleport around someone before actually going in for the attack, since you'd still need to wind up for it after teleporting, you may as well try to fake them out.
And I think more important than them changing stances between dashing and reappearing, is how after these dashes they wind up for attacks, how you can see them recoiling, regaining their senses, and then dashing away. I don't think this makes sense if they're meant to always be Immeasurable, or if they're meant to occasionally be Immeasurable when moving around like that, especially if you're arguing that Dante reacts to those Immeasurable parts (since that brings up the question of why Dante doesn't utterly shitblitz them while they're not using it).
No, I do think the evidence provided still makes sense for them briefly seeing the world between dashes, and being able to adjust things based on that.
He doesn't do that as Fury passes by, he does it a bit after. Plus, Fury leaves a trail and makes a noise with that dashing. And, ofc, the final reaction by Dante can be done as Fury stopped dashing and had to perform an attack, as you can tell by the distinctly different visuals and accompanying sound effect.