Yeah, but on second thought, what you are saying doesn't make sense. Sure,
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(VIZ translation of that scan you posted), but that doesn't mean he's transporting himself at the literal or anywhere close to the literal of speed of light.
1. If his top speed was light speed then there's no reason that using his tech for the short time he did would drain his stamina so much that he'd go from light speed to a speed where the weakest incarnation of Sasuke (in a weakened state no less) in the Manga could outright dodge him. Not a chance. That drop in speed does not correlate with his drop in stamina.
2.
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Those reflections of him in the mirror are representations of the ACTUAL speed of light. What he does afterwards is clearly shown to be different.
So yeah, no. Haku is absolutely nowhere near light speed no matter how healthy he is.