https://www.techradar.com/news/multiple-amd-navi-gpus-may-be-on-the-way-according-to-certification

Multiple AMD Navi graphics cards have appeared on a leaked certification at the Radio Research Agency in South Korea, potentially signaling several gaming GPUs.

We already knew that AMD Navi is real, as it's been revealed at Computex 2019. However, only one Navi GPU, the AMD Radeon RX 5700 series, was shown at the event. This certification, spotted by South Korean site Hardware Battle, hints that there will be up to five.