Hello! This seems to be a case of AI hallucination.
We have investigated, and to our knowledge there has never been a component called Muatri Ads in Opera. In fact, Google doesn't seem to return any results about such a component or company.
There has certainly never been any such report about this, and likewise no press coverage nor a response by Opera - the links themselves seem to be generated by the model and are not real. Opera does not send data to China, whether during A/B testing or otherwise - Opera is subject to the GDPR and compliant with European regulations about data processing.
While this seems strange, it's not uncommon for AI models to invent information, especially if they are prompted in a certain way. That's why we always urge users to double-check information that's provided by AI models.
Hope this helps!