Not in canon
The only reference I can find to the Breen's organic-based ships is in Tuvok's line in VOY 'Scorpion'. However, out of canon, we see that there is further explanation (emphasis mine):
Their technology consisted of an element of biotechnology that as based on the algae on their homeworld. The Breen learnt to manipulate the algae genetic structure and use it to create biomaterials with special properties such as metal, plastic, silicon as well as other such substances. Such a key trait meant that every Breen vessel included its own hydroponics bay where damage components could be regrown. (TNG module: Star Trek: The Next Generation Core Game Book)
However, in terms of canon, then yes, this does seem to be a throwaway line before the Breen were properly explored in the ending arc of DS9 which aired after 'Scorpion' (which first aired in 1996).