The nerfs won't affect good Ahri players
The Ahri players that know how to land charms consistently will not be feeling those nerfs as hard. The changes are more towards phasing out the people who abuse Ahri's point and click burst on her ult and W, while giving her better counterplay.
Ahri's play was too rewarding and forgiving for sloppy players at the cost of other champions. This is just a step in the right direction.