From Peter's link. This is the ECHR judges giving the background to the case, speaking about the original judgment by the Austrian court:
"13. The statements which the court found incriminating were the following:
English translation:
“I./ 1. One of the biggest problems we are facing today is that Muhammad is seen as the ideal man, the perfect human, the perfect Muslim. That means that the highest commandment for a male Muslim is to imitate Muhammad, to live his life. This does not happen according to our social standards and laws. Because he was a warlord, he had many women, to put it like this, and liked to do it with children. And according to our standards he was not a perfect human. We have huge problems with that today, that Muslims get into conflict with democracy and our value system ...
2. The most important of all Hadith collections recognised by all legal schools: The most important is the Sahih Al-Bukhari. If a Hadith was quoted after Bukhari, one can be sure that all Muslims will recognise it. And, unfortunately, in Al-Bukhari the thing with Aisha and child sex is written..{That Mohammed married Aisha when she was six and consummated the marriage when she was nine].
...
14. The Regional Court found that the above statements essentially conveyed the message that Muhammad had had paedophilic tendencies. It stated that the applicant was referring to a marriage which Muhammad had concluded with Aisha, a six-year old, and consummated when she had been nine. The court found that by making the statements the applicant had suggested that Muhammad was not a worthy subject of worship. However, it also found that it could not be established that the applicant had intended to decry all Muslims. She was not suggesting that all Muslims were paedophiles, but was criticising the unreflecting imitation of a role model. According to the court, the common definition of paedophilia was a primary sexual interest in children who had not yet reached puberty. Because paedophilia was behaviour which was ostracised by society and outlawed, it was evident that the applicant’s statements were capable of causing indignation. The court concluded that the applicant had intended to wrongfully[i accuse Muhammad of having paedophilic tendencies. Even though criticising child marriages was justifiable, she had accused a subject of religious worship of having a [i]primary] sexual interest in children’s bodies, which she had deduced from his marriage with a child, disregarding the notion that the marriage had continued until the Prophet’s death, when Aisha had already turned eighteen and had therefore passed the age of puberty. In addition, the court found that because of the public nature of the seminars, which had not been limited to members of the Freedom Party, it was conceivable that at least some of the participants might have been disturbed by the statements."
So Sabaditsch-Wolff's accusation of paedophilia was wrong not because Mohammed had sex with a nine-year old (this fact is agreed), but because sex with a nine-year old is not the regional court's definition of paedophilia.