I personally think that if the lightspeed skipping scene is removed, the later mention of it also has to be removed somehow. You can make the argument that “lightspeed skipping” in this context just means crashing through the ice wall at light speed, but I think new viewers will just be confused by the term, and every time I watch the later scene myself I’m going to be thinking of the earlier scene that was cut.

Ultimately though, I think the lightspeed skipping thing, while it doesn’t make sense if you pick it apart, is one of the least offensive things in the movie. You can handwave it away by saying that lightspeed tracking has technologically advanced since the last movie to the point that they can fit it into TIE fighters, and all the planets they travel to could easily be in the same system. By removing it, you’re also robbing the movie of the only significant action setpiece in the first act (and arguably the only unique or visually interesting setpiece in the entire movie), which makes it feel like a bit of an exposition dump for the first 20 minutes or so. RoS as-is isn’t much more than a pretty roller coaster ride. I wouldn’t try to rob it of one of the few elements that works.