In Beast Machines they were part organic, that's why they had to 'morph' in order to transform. That's not so when it comes to the BW cartoon - Their 'organic exterior' had more in common with G1 Pretender shell technology which had no internal organs or blood.
In the early BW toy bios they were indeed portrayed as Cyborgs but since the cartoon decided to forge its own considerably different take, those early bios were abandoned.
Cicadacon did appear in the first 'The Agenda' episode with what we must assume to be his 'Cybertronian mode'. His character model was radically different to the toy but his is a member of the Tripredacus council.
When it comes to consumption of organic food for fuel - A machine doesn't have to be a cyborg to do that. Machines today can use organic fuel for energy. Also remember that the G1 Insecticons used to consume organic produce which they converted to Energon just like the BW characters but they were not cyborgs.
Cars also have a digestive system of sorts but they are not organic, the same goes with other organic fueled machines.