Honestly, you're just being argumentative. The researchers haven't proposed that they've backdoored your computer, but historically every impressive hacking feat is built on a stack of "obvious in hind-sight" novel abuses.

Instead of writing it off as Rube Goldberg over-engineering, it would be a lot more useful (and fun) to consider what these sort of attacks could do in less obvious conditions.

The people who put the 2600hz tone whistles in the breakfast cereal didn't anticipate Apple computers.