I assume you're referring to this[0]. I had to go searching.
I do buy it. Collective Shout, Mad Fucking Witches and others have all been trying to cancel media personalities and companies for years by appealing to the advertisers, especially effective in traditional media where they money is drying up. They're hardly a fly by night group, and it's not their first time appealing to payment processors.
0. https://www.news.com.au/lifestyle/real-life/news-life/400-vi...