its grammatically incorrect. The problem lies in the double negative.
"Never" is a negative word.
"Had" is used in the past perfect tense, which implies something that happened before another event.
When you combine "never" and "had" in this way, it creates a double negative, which is generally considered grammatically incorrect in English.
Here are a few ways to correct the phrase:
"As quickly as he had ever" - This emphasizes the speed of the action compared to his previous experiences.
"As quickly as he ever had" - This emphasizes the speed of the action compared to his previous experiences.
“Faster than he ever had" - This focuses on the speed of the action itself.