Blimey -- glad someone spent their research grant proving that with enough effort any kind of security can be breached. In the whole risk/cost trade off, I don't see anyone caring one jot about this kind of "threat".

In this case, all you need is a CPU where the hardware can be reporgrammed... which almost no-one makes or uses. So by continuing to buy a standard Intel or AMD system, we can sleep safely. Phew!