The SSBWiki (which is the one I meant - I tend to forget the difference) says Rosalina has had the most nerfs of any character, listing 17 nerfs, except she didn't get 17 nerfs.
The problem with it is that it is listing any value reduction as a nerf, even though they are not synonymous. For example, Rosalina has had various knockback reductions (sometimes caused by barely noticeable damage reductions, like the recent 0.3% damage reduction to her rapid jab) on multi-hit moves for the purpose of making the multiple hits connect better. Which is a buff, as it means you get more damage in with the move as more hits get in, and you are less likely to have the opponent accidentally fall out of the move and suffer an unfair punish because of it (since the last patch to Rosalina, I've been doing more damage with her jab than I did pre-patch, because more hits get in). But because a value reduction was involved, whoever wrote the page listed it as a nerf, even though it isn't. Which is a lack of understanding of what the term actually means. It doesn't simply refer to value reductions, it refers to a move that is made worse. However, value reductions sometimes IMPROVE moves, meaning they wouldn't be nerfs, they would be buffs.
Also for some reason, Luma's faster call back speed and uncharged Luma Shot not going as far are listed as "neutral changes", even though they are clear buffs. In both cases, not only was Luma's versatility and usefulness improved, but they also reduced the cooldown time Rosalina suffered from those animations. Which is a blatant buff.
In the case of uncharged Luma Shot getting a distance reduction, it was a good thing because when the game launched, there wasn't much difference in the distance between how far an uncharged, partially charged, and fully charged Luma Shot went, meaning you had less control over where Luma was placed after launching him than you do now. Combined with the long cooldown time she initially had on the move, Rosalina's Luma play was severely limited, as sending out Luma was much more punishable and you couldn't control him all that well because of the lack of variety Luma Shot charge distances had. Also it's a great poke move now, especially against overly aggressive players/characters.
This is part of the reason why I think Rosalina now is overall better than how she was when the game first launched. But the point remains that people undersell the buffs Rosalina got, or call certain buffs "nerfs" when they really shouldn't.