You have an iPod Touch 4th Generation. I looked into it, and while the first two revisions of the 4th gen Touch only came in 8, 32, or 64 GB, the final end-of-product version, released in 2012, was available in 16 or 32 GB sizes.
All four sizes will have the same guides and procedures, so you can follow the link to the device page on the top right. We'll get the identification tool updated, thanks for finding that issue!