Yes, that's definitely a lead in to yet another comedy video illustrating the difference in phonetics.
I'm certainly not a linguist, but I do notice a rather significant difference when I listen to german vs one of the other Germanic languages in the above video. A brief Google search reveals this page (which actually references the previous video) which suggests that "When people talk about ‘harsh-sounding’ languages, they’re usually referring to languages that have sounds made in the back of the vocal tract". Personally, I don't find German to be all that more harsh, but it seems (I have no evidence) to be easier to make it more "clipped" (maybe "enunciated" is a good word?), which makes it much easier to make it sound harsh. With all the native German speakers here on the forum, I'm wondering what you folks think about this.