They thought they had — the article says they were using some content moderation tools from OpenAI, but it didn’t work as expected (and it was probably their fault for not leveraging the tool correctly.) They are planning to fix it before going live again and add some secondary content filtering as well.

cool, now... imagine an AI, responding to any act of transphobia, and seeing it followed immediately with hundreds of people screeching "that's not transphobic".

it would be more surprising if an AI could properly identify acts of transphobia than literally any other outcome.