I don't think it supports 2.4GHz at least it's not on their spec sheet which makes sense why 802.11b/g is not supported as well. The 802.11n you see would most likely be on the 5GHz as WiFi 4 supports both 2.4 and 5GHz.
Ubiquiti's new UDB Switch is designed to easily connect multiple remote IoT devices with wired connections to a network and supply them with power via PoE+. To do so, the switch uses a WiFi 7 uplink across three frequencies. For instance, the 6 GHz band should be suitable for environments with heavy WiFi traffic.