I don't think the Variety article you linked is the most ideal source of information in this case, seeing as the article itself doesn't actually contribute any unique reporting and instead links to earlier coverage of the alleged incident by Australia's Daily Telegraph and an audio recording of “The Kyle & Jackie O Show” on Australia's KIIS FM wherein the implicated producer, Joshua Fox, gives a personal, unverified account of the alleged altercation. Because of this, I don't believe you can confidently rate the claim as true using only the Variety article as your source.