As far as I can find (with very little searching of what you linked and related pages), they weren't advocating for the dissolution of Germany or even much more regional autonomy. They only begrudgingly accepted Weimar.
For the NSDAP thing, I'm just going off the Wikipedia article you linked, where it mentions they began swerving hard-right and moving for a coalition with the NSDAP and other nationalists, and the quote
Dingeldey fended off calls to merge with the Nazis only with difficulty.
As far as I can find (with very little searching of what you linked and related pages), they weren't advocating for the dissolution of Germany or even much more regional autonomy. They only begrudgingly accepted Weimar.
For the NSDAP thing, I'm just going off the Wikipedia article you linked, where it mentions they began swerving hard-right and moving for a coalition with the NSDAP and other nationalists, and the quote