Only some of the geothermal tech requires injection of fluids along the lines of Fracking. The article suggests for those cases the risks are lower, due to the

Only some of the geothermal tech requires injection of fluids along the lines of Fracking. The article suggests for those cases the risks are lower, due to the different pressures and fluids required. Other techniques (closed-loop systems) don't require it at all (but do require advanced drilling tech).