I have connected a device to my Draytek 2866ax and also my Draytek 2766ax.
Both times the connection was 802.11ac (so WiFi 5) but the authentication was SAE and so WPA3.
However, the station shows as Status "A" which is WPA2 but I captured the wireless trafic (with WireShark) and I know it was SAE (WPA3) and so the Status should be "S".