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Moreover, like in Aurelion Sol and Fiora's case, is it really Riot's practice to nerf a champion when they're giving a champion new skin?

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almost 3 years ago - /u/R0gueFool - Direct link

The balance and skin teams are 100% separate. Skins are being made months in advance, while the balance team tends to plan changes shortly before they release, looking at the most recent patch(s) data. In fact, the balance team isn't even aware of what skins are coming up and find out about them at the same time as the rest of the player base.

As for the balance changes themself, these do not take into account a champion's performance in URF or ARAM. Though it will also change in those modes.