They found bits from random savefiles and constructed something vaguely resembling a simulator route out of it. If even that. “Leak“—the Malaysians are not good faith players in this.
Really, I can only point to this: https://news.ycombinator.com/item?id=34509899t. Maybe look into the MS Estonia sinking, the cover-up (of the unfortunate results of a spy game) is very obvious there.