Your behaviour is indistinguishable from that of someone who is defending them, since you're arguing their side of the lawsuit. The magazine is legally required to publish a reply which is "suc­cinct and con­fine[s] it­self to the sub­ject mat­ter of the con­ten­tious rep­res­ent­a­tion," not any given reply that Palantir wants to make. As quoted at several removes, "Republik’s managing director Katharina Hemmer said Palantir had wanted the magazine to publish a very lengthy counterstatement to each article. Republik believed the proposed statements did not fairly address or rebut the reporting"