I'm not convinced that's the proper reading of that law. FWIW, I'm not a lower just a person with an appreciation of legal questions. I was under the impression that the word 'imminent' implied you had to reasonably be aware those people were going to commit a crime immediately. For example if you're at the front of a mob of angry people and tell them to go loot a shop. I think it would be hard to convincingly say that on a website where 99% of users are joking that posters were inciting crime directly.