Hello Wetzel, he can´t be right because eg. officers (or SSleaders) did wear the officers (dagger) portepee on their bayonets in case they did wear it (mostly in the earlier times, there are a lot of phtographs documenting this fact).And see the first chart of yours, the NCO troddel has also a closed acorn.
Generally we can say that portepees were worn on all edged weapons (daggers, byonets and sabers) only by officers and socalled "Portepee-Unteroffiziere", the higher NCO ranks who were allowed to wear the (officers) portepee. All others did wear Troddeln.
But it is not so simple because eg at TN there were special knots for those "higher NCOs" which had a silver thread within and inly colored knots for men and lower NCOs.
Army offier daggers, with portepee, were ONLY worn by officers and commissioned(!) NCOs (therefore a true officers rank) against in the navy or the air force all the daggers could be worn, with (officers) portepee also by NCOs "with portepee".
I myself wanted to clear the question long ago but found out that even "specialists" on knots in the different www forums did not know exact borders. Could also no find any substancial in the net.
Regards,
