Definitely relevant. Old dwarven stories are a form of cultural expression. They offer a unique perspective on a fictional culture that can be studied and analyzed. Also, they are entertaining, and people still enjoy reading or listening to these stories for the adventure and mystery they contain.
Yes, they are. They are a part of fantasy literature heritage. Many modern fantasy works still draw inspiration from old dwarven stories, like in some role - playing games where dwarven characters are based on the traditional concepts from these stories.