I am not sure either why you’re being downvoted on a non-controversial comment. I’m also honestly curious. Is your statement being conflated with ‘speed reading’? A quick search finds plenty of similar recommendations. From one of them:
“The more you read, the more you will be better at it. The better you are at reading, the more you will increase your reading speed.” [1]
[1] https://www.lifehack.org/articles/productivity/10-ways-incre...