Libel has to be aimed at a specific individual or a small identifiable group of individuals. Statements made in court are protected. Without knowing exactly what was said, I can't really comment any further on that. I have not read the transcript, so I don't know what you are referring to, I'm afraid. If you want to tell me more, I will be happy to comment.
Re the bad character evidence, you may think it is admissible under gateway 5 (substantial probative value in relation to an important matter in issue between the defendant and a co-defendant). However, in R v Samuel, it was held that the defendant's previous convictions for assaulting his partner were not relevant in a case of assault of another individual where the issue was whether he had the specific intent necessary to make out the offence. That is extremely close to this case, where the defendant had previous convictions for violence and the main issue was whether they intended to incite others to commit offences. Given the Samuel decision, it is unlikely that the courts would agree that the defendant's previous convictions were relevant in determining intent. That is even more so when you consider that, in the Samuel case, the convictions were for assault and he was being tried for assault, whereas in this case the convictions are for violence and the charge was inciting others.
Under gateway 6, the defendant very specifically said that they had never harmed a woman. If they had said they had never harmed anyone, that would have opened the door for their convictions to be introduced. However, since their convictions are all about violence towards men, gateway 6 does not give a way in.
Nothing in this case appears to trigger any of the other gateways.