Few will click through, so I'll copy the part where he actually talked about child pornography below. First of all, both times the term "gatekeeping" was used in that link were specifically connected to "censoring political opponents". He was not talking about pornography. He was talking about censorship.

Bringing up pornography is always the bludgeon of anti-free-speech people. If I say, "People should have the freedom to express themselves," some idiot will inevitably say, "This evil person said that everybody should be allowed to make child porn!" This sort of rhetoric is the death of thinking.

Asked if he realised "what [he was] defending" - which is essentially Grok being used to generate non-consensual pornographic or sexually explicit images of women and girls and child sexual abuse material (CSAM) - Sweeney said: "I defend open platforms, free speech, and consistent application of the rule of law. The bad stuff people do with AI, I do not defend, but I staunchly oppose the wrongdoing of a few from being used as a pretense to undermine the freedoms of all"

When challenged and given examples of Grok generating "CSAM content and doxxing people's IP address", he replied: "1) That is bad. 2) Every significant AI has instances of this. 3) Every significant AI company makes their best efforts to stop it. 4) All are imperfect.