patur Avul Assur
Tha mains source that is qouted there is Rav Avrohom Ben HaRambam and while it seems to indicate that there is “ksav yad” that’s actualy not the case the Ksav Yad has the part nefore and the part after but not the one where that “shitto” is written.
For a full anaysis of the section indicated please see Torah, Chazal, and Science.