Hello, I am ddeckys, the person that was collaborating with him at the time, and am a respectable Minecrafter.
Being with him during the majority of his experience with opticraft, I assure you I never saw him doing any of the sort. A lot of times, near the spawn location of the city, everything is so mined out that it can sometimes be hard to tell if something is someone's build, or a random greif.
I understand that block history doesn't lie, but knowing this Minecraft personally, I know no harm was intended. Sorry for any misunderstandings.
EDIT: If it matters, I can get a large amount of people from my community to vouch him (tiny.cc/tdcf)