What a fun question!

Obviously the answer is that its a non-question. The amount an author reads doesn’t correlate to success. Plenty of authors are voracious readers, others rarely pick up a book.

What do you see with a lot of creative authors (but not all) is a dedication to the craft. Putting in hours of writing. Often editing or just tossing everything.

I have noticed though. People on my team best capable of writing technical documentation. Read a lot of technical documentation. This is the exact domain GPT can Excel at, and one where generic language is accepted.