I think you're wording it wrong. It looks like she'll be revealed as soon as she leaves the shroud area instead of about 1.5-2 seconds after she walks off. She should still be able to be stealth'd if she leaves and goes back, but now she can't just shroud during a gank and walk off due to the seconds of reaction time they won't have to catch her.
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Akali is kind of flavor of the month right now, and many, many times over the past few weeks I've seen Akali juke a whole team trying to cover all her exits because she is still invisible a full second after leaving. It's ridiculous, just make it work as intended. The red line is clearly there to show her area of invisibility, and she wasn't supposed to be able to keep the stealth outside the circle.
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