The caption on the image of the iPad is misleading. If I´m not mistaken, virtualisation is not permitted on iPads even if they were capable; the picture seems to be illustrating remote desktop.
That's the case for all examples here - they are virtualizing your "desktop" on a server and all you're doing is remoting in. AKA thin client aka what the industry has been trying to sell for 20 years. Pretty much the same as: http://www.vmware.com/products/view/