I just checked again at ...

https://www.kajaklimfjord.dk/index.php/forside-kort-5a-lovns-bredning

I thought it was part of this description. But you are right it is not officially mention here.
On the other hand it connects the two official kayak campsites at Jelse Odde (see Udinaturen.dk) to the rest of the kayak network in this region. Otherwise these were just two isolated nodes.
From my own experiance I know that this route is frequently used by kayaks, SUPs etc. Maybe the tag informal=yes should be added here, until we find the official route description.