Thats how people have always explained making the rolling R sound for Spanish to me which is different from a rolling R sound in German. I was never able to make the Spanish r sound when I took it high school.
In the "guttural R" used in German the sound is made in the back of the throat without the need to press ones tongue against the roof of the mouth; just the base/root of the tongue against the uvular.
https://en.wikipedia.org/wiki/Guttural_R
This video explains it well with really fascinating videos clips showing a cross section of the mouth live while speaking. The whole thing is interesting but the main difference is shown at 3:30