The backplate will require stripping off the corrosion and repainting...
That type of work is what forum members do when they refurbish second hand dishes. It can be a rewarding task to transform a dish and mount/stand into good cosmetic condition and working order. Included with the Technisat 2.0m dish are an actuator, polar mount and what looks to be a galvanised ground stand. The only component that I would have concerns about working is the actuator. In my opinion, the package is worth a lot more than the scrap value.
With the Technisat 2.0m dish, if the seller confirms that the dish is not damaged and can be dismantled without problems then it should be a good dish for C band and in my opinion it is worth buying.