Yes. If you are accessing a Windows client OS as your guest operating
system in the datacenter from any non-SA device (including thin
clients, iPads, etc), Windows VDA is the appropriate licensing vehicle
regardless of the VDI software vendor you choose. The only scenario
where you would not need Windows VDA is if you were using PCs
covered under Software Assurance as the access devices, since
virtual desktop access rights are included as a benefit of SA.