Up until that point, there was no public information or official confirmation that Billie Eilish, the singer-songwriter, has OCD.
It's important to be cautious about assuming or spreading rumors about someone's personal health or mental health conditions, as this information should be treated with respect and privacy. If Billie Eilish were to openly discuss her experiences with OCD or any other mental health condition, it would be up to her to share that information if and when she feels comfortable doing so.
Remember that celebrities, like anyone else, deserve privacy regarding their personal lives, and speculating about their health without official confirmation can be intrusive and potentially harmful. If you have any questions or concerns about OCD or any mental health issue, it's best to seek information from reputable sources or consult with a healthcare professional.