They outright gutted her and called it a "rework", heck they even went as far to call it a "buff". That's the most delusional thing they could have said and they still deny that their rework has made her considerably worse.
What use is a hypothetically great lategame if her kit doesn't even support it? She has no range, she has no mobility, she has no durability. She instantly blows up, no matter how much AP you stack on her. Heck, the most you'll get from that godawful passive are 100 additional AP - as if that could turn her into a hypercarry all of a sudden. Veigar gets that much from laning alone, meanwhile you have to spend 40 minutes to get that far.
And let's not forget her godawful ratios and nerfed flat damage, it takes 700 AP just to make her E as strong as her old one. She's simply worse in every single regard, there is absolutely nothing good about this rework.