Perfectly safe. Every part is checked and verified exhaustively. Planes that are written off (after a crash) are often parted out. If the engines are still good (which these are), they're shifted on to another plane (Dr Peters is leasing the RR plants on their bodies back to Airbus/Singapore). Landing gear will be good, as will the usual movable gear like flaps, spoilers, flaperons... the APU will also still be in excellent condition. The interiors will have been gutted by Singapore already, taking what they can (and what's theirs anyway).
This recycling job will be good news for the airliner recyclers, because they get to document and figure out how to recycle an A380 as best as possible.