Twitter definitely removed pornography which wasn’t labeled or which was posted without the consent of the people involved.
As for CSAM, whoever told you that is blatantly lying to you. There are annual reports showing thousands of reports to NCMEC and accounts getting banned - here’s last year:
> Infamously, Twitter did not even remove reported CSAM until after Musk purchased the company and fired the director of Trust and Safety
Source on this?
Anecdotally, the reaction of everyone I know working in law enforcement to the Musk purchase and subsequent layoffs was "this is going to make it infinitely more difficult to get CSAM taken down from Twitter".