Question about TP-Link Archer TX20E Wi-Fi 6 PCIe adapter AX1800 Bluetooth 5.2

The adapter supports Wi-Fi 6, which means that it is not specifically designed for WLAN 4 (Wi-Fi 4). Wi-Fi 4 is based on the IEEE 802.11n standard, while Wi-Fi 6 uses the newer IEEE 802.11ax standard. However, the adapter should be able to communicate with older Wi-Fi standards such as Wi-Fi 4, as modern Wi-Fi adapters are usually backwards compatible.