The videos show someone was to installed Windows Phone 7 Operating System into a Windows Mobile 6.1 device HTC Touch Diamond.

Srlek replied "Offcourse it's RDP, but so is every other WP7S video running on current hardware :) ", so obviously this is an RDP, performance isn't very good as you can see from this video, since WP7 requires a more powerful processor/hardware to suppor it.

source: engadgetmobile