Jitter can sometimes be greater with optical S/P-DIF connections than with electrical ones. But the recorder should "slave" itself to the incoming data on a sample per sample basis, and should record each sample exactly as received. So as long as the connection maintains its integrity, the jitter shouldn't matter.
The situation becomes more complicated if the receiving equipment (mixer or recorder) uses asynchronous sampling rate converters on its inputs. But your recorder doesn't.
--best regards