There's no Product Red iPhone X, but Apple did make three red cases for it
https://www.techradar.com/news/product-red-iphone-x
You won't find a Product Red iPhone X alongside the new red iPhone 8 and iPhone 8 Plus color that launched today. It's just Apple's 'regular' iPhone in the new hue.
That doesn't mean you can't envelop your otherwise-more-advanced iPhone in the deep red tone that helps raise awareness and money for the Global Fund HIV/AIDs charity.