Kvod Harav, since Yom Kippur is also the true day of Kabalat Hatorah, as the permanent Luchot were given on that day, why is there no mention at all in all the Tefilot and Pizmonim of this Holy Day of anything about it?

Horav Shlomo Millers’s Shlit’a opinion is that it is included in all the many Tefilos and Viduyim of Teshuva, since that was the cause and reason for the giving of the Second Luchos.