Do we know who was on the jump seat? Surely the third pilot rather than the engineer? His remarks seem to me to be based on observation from the cabin rather than the flight deck but it isn't too clear.
Once again poor translation and incorrect usage of English is muddying the waters. He was an aircraft engineer, not a flight engineer. For the benefit of those (many) here not au fait with aviation terminology this means he was ground maintenance personnel. NOT flight crew.