Short answer Yes: the Switch allows multiple devices to share the Ethernet network at up to Gigabit speeds ( speed depends on network network card / port on device, speeds can be mixed)
Longer conditional answer. Yes, If the AEx is acting as the router / DHCP server , then each new device will be allocated an IP address and routing information from the AEx , the switch acting as a port multiplier for the Aex ( you can plug more things into it)
If the Aex is acting as a wireless bridge, to a router located elsewhere, Yes, mostly (The Aex acting as a virtual Ethernet cable to a wireless router) Speed is then limited by the speed of the wireless connection. (more info here)
Note: Audio Data rates are quite low, depending on source.