Huh? Where do you get this information?? Diamond has been around since 1988 and never went out of business!
One of my first 3d cards was a S3 Diamond Viper.
They did go out of buisness for a while. Look at their page. It has support for products pre #%#% and support for products after that. There is a reason why they seperated out the support. Its because they were a different company when they made the older products.