I don't know why everyone is dooming about the Aurora changes. Even just glancing, it's not a huge change. In fact it's a pretty big buff for lower elo players because of the added scaling attached to her passive. She will be weaker early, but not by much. And around 214 ish AP she breaks even on the adjustment.

Her Lisandry build first item loses between 12-18 damage from the passive proc, depending on health. The Burst build loses much less, around 6-10. At her 2 item core she only loses 4-5 damage. And her burst 2 core build gains about 5-7 damage on average. At full build for her Bruiser, she gains 2% more for her passive. Actually, at 2.7% per 100 AP, it's 10.8 compared to the flat 8% she had previously. Full burst build is 18.9% compared to her 14%, tool tip showing a 3% increase.

As far as nerfs go, this is more like an adjustment. In low elo, she'll be much stronger with the game length. She'll deal less damage on her build path in the laning phase, but the laning phase isn't where her core build even matters. If they wanted to target her 2 item core, or 3 item core for Bruiser, they went about it in a weird way. A small decrease in damage, upwards of 5-7 damage, is nothing.

Here, I provided pictures too. Left Dummy has 2000 HP and 50 MR, about the average for a level 12-13 Ahri over the 4 games I looked at vs Aurora. Top is 3500 HP and 100 MR, generic tank. And right is 2000 HP no resists.

https://imgur.com/a/GwFhHNO