The model is censored for NSFW content, they explain that clearly in the model cards on Huggingface.

Emad also confirmed a couple of hours ago on Discord that although most artist's styles weren't explicitly removed from the training set, they were never in the training set in the first place. The only reason v1 understood "Greg Rutkowski", etc. is because they were included in Clip's training set, which was trained by OpenAI. Finer control of what the model does and doesn't understand is the main reason they switched to a new text encoder.