We suspect that these are just placeholders. Sapphire simply registered all possible trademarks to save time. It seems very unlikely that Radeon RX 5000 series would feature that many SKUs. AMD has not released this many cards in a very long time.
However, it is possible that AMD still has something to say in the high-end and enthusiast market segments. There had to be a reason why AMD did not name the Navi10-based models as RX 5900 or RX 5800. A dual-GPU RX 5950XT anyone?
[EEC] Sapphire RX 5900/5800/5700/5600/5500 Series (also RX 590XT). https://t.co/8ejyYLmiaX pic.twitter.com/YmvKttXfgJ
— ?????????@Komachi (@KOMACHI_ENSAKA) 26 juni 2019
The site also has a bunch of EEC database details about GeForce RTX SUPER and Radeon RX 5700 cards from ASUS, Gigabyte, and Palit over here.