I'm not aware of any information about Usher deleting his entire Twitter history. It's possible that he may have deleted some old tweets, but I couldn't find any credible sources confirming the deletion of his entire Twitter history.

As for the link you provided (https://m.primal.net/KyUr.jpg), it appears to be a reference to a website or image hosting service called Primal, and the filename "KyUr.jpg" might suggest that someone shared an image with Usher-related content. However, without more context, it's difficult to determine what this has to do with Usher deleting his tweets.

If you have any more information about what happened, I'd be happy to help clarify things!