In many threads dedicated to various services, the initial message contains outdated information. This is almost always the case if the thread is opened not by a representative of the discussed service. I believe there's nothing wrong with that. Personally, I tend to read the latest messages in a thread rather than the first ones. I assume I'm not alone in this.

As for the rules, it's better to clarify in the Meta section. Duplicate messages are prohibited, but if it involves translating a text modified beyond recognition, it's unlikely that the translation can be considered a duplication of the original text.