I have to disagree on that point of view; or all the photo's of Erinnerung an Brod are made of a wrong rose and the description doesn't match this rose... And Erinnerung an Brod is a once-bloomer!
I have grown and observed the "Tylor Carrl" rose for 30 years and have noticed all the variations and mixes in colors from light red to dark red to black with an array of bluish violets and purples, matching 'Erinnerung an Brod'.
Then please explain, why this rose is described as a hybrid perpetual? As for the for the form: the only flower (on photo), that is posted on HMF, doesn't look like Erinnerung an Brod at all. Other characteristics aren't posted as photo's. Did You photograph Your 30 year experience with this found rose? (maybe to share with the HMF community?)