I see that your pseudo-knowledge of science extends to automotive theory.
just about as successfully as it does evolution and cosmology...
Some Camrys have timing chains, others have belts. Apparently from the first Camrys using belts to some point, the belts (if/when they broke) broke destructively, i.e. valves went through piston tops. At some point they changed that and started making engines for which timing belts would break non-destructively.
What this case sounds like is a case of a timing belt breaking destructively; at least that's one possibility.