You are. The physical principle of using microwaves for drilling is a sound concept, the application, refitting coal plants as geothermal, is a very good idea.

Predicting the future is always error-prone. Simply predicting failure is a cheap cop-out.

I am not saying they are going to fail but claiming to drill farther than ever before (which was an outrageously expensive research project) and do that at controlled prices is an extraordinary claim. So my hope is they can show it can be done at any price. Then surely it will create a path for this to become economically viable eventually.

The optimism in the article is palpable, tho I feel it too. It’s a great vision — let’s see that first bore and I’ll lose this doubt.

Nitpick: the residual heat from Earth's formation is not renewable

Then nothing is, as the sun will burn out at some point (since we are nitpicking :) )