It appears this Tweet with horrifying CSAM imagery was posted by dom_lucre - an account with 571.7K followers - on July 22nd.
— Faine Greenwood (@faineg) July 26, 2023
It took until JULY 26TH for the account to be suspended.
And a LOT of people saw the images in the days in between, whatever Elon may claim. pic.twitter.com/T2l98v1fgK