As of my last update in October 2023, "https://openai-openai-detector.com/" does not appear to be an official website associated with OpenAI. OpenAI's official website is "https://www.openai.com/".
If you come across a website that claims to be related to OpenAI but has a different URL, it's important to exercise caution. It could be a phishing site or a scam. Always verify the authenticity of the website by checking for official announcements from OpenAI or by contacting OpenAI directly through their official channels.
For accurate and up-to-date information, always refer to OpenAI's official website and their verified social media accounts.