I drove the tour more spontaneously and have to say it works with a gravel bike. However, there is hardly any good ground for the narrow tires on the tour between Radeberg and the B6 (mountain bike is an advantage here)
From the B6 to Wilschdorf the section has its pitfalls, there is nothing to get here with speed with a gravel bike.Wilschdorf, Helmsdorf, Stolpen, Fischbach is a great route without almost shaking your bike.