If it wasn't, enhanced geothermal would be everywhere, which it isn't. (Yet, this company would say.)

Op is really just describing a core breakeven metric on the energy source. In the same way you measure an oil well with half-life of useful output, this is basically saying "EGS can prove to be useful if they can make sure they extract more economically useful heat than the economic costs of constantly drilling new wells."

Since no one has really made EGS widespread yet, that suggests no one has yet cracked this nut.