I don't believe this is the case, as OpenAI was able to hex (an immediate disable) Earthshaker before he got off Echoslam (a spell with no cast delay except the time to click the key).
The ES player didn't queue his abilities so there was delay between blinking and casting echo. Someone counted the frames and it was well over the 200ms minimum.
Yeah. I agree. It was over the 200ms minimum but it was artificial. No human could reasonably perform that type of action as relilably. And that has nothing to do with learning performance.
You can queue abilities to instantly cast them after the previous one finishes, so it is actually quite reasonable for a human to perform that type of action quite reliably.
There's no delay, but when people looked at the replay, Earth Shaker was actually visible when he thought he wasn't. The AI that disabled him had precast his spell on the out of range Earth Shaker, so when Earth Shaker blinked in to range, the precast spell went off in the following server tick.