The stick may have been pushed forward but the computer decided to send an elevator up command.....and therefore the DFDR data recorded seems to point to a pilot input rather than a computer command
The DFDR on newer aircraft records the movement of the individual sidesticks and the physical movement of the elevators all separately, so you can readily see if there is any difference between them.
In the report they mention that at one point both pilots were making control inputs. That would have been seen on the DFDR.