That is actually just to light the coals. I think the idea was for an actual hookah bowl/head that is self heating and can "cook" the shisha in a clean way, my guess for maximum taste.
But as for the constant heat thing, that would be a challenge. As mentioned, coals get hotter when you inhale. A constant temperature on a bowl my end up just wasting shisha in the end by"cooking" it all to quickly.
I think hookah smoking will get more technological and savvy as the years progress. I think it would be a great idea for lounges, no more coal. Give it some time, someone is bound to invent something radical like this.
and than charge a ridiculous price for it.