Confession on Good Friday and Holy Saturday

The Congregation for Divine Worship issued the document Paschales Solemnitatis in 1988 which states:

"59. On this day [Good Friday], in accordance with ancient tradition, the Church does not celebrate the Eucharist: Holy Communion is distributed to the faithful during the Celebration of the Lord's Passion alone, though it may be brought at any time of the day to the sick who cannot take part in the celebration." 

"61. All celebration of the sacraments on this day is strictly prohibited, except for the sacraments of Penance and Anointing of the Sick. Funerals are to be celebrated without singing, music, or the tolling of bells." 

"74. On this day [Holy Saturday] the Church abstains strictly from the celebration of the sacrifice of the Mass. Holy Communion may only be given the form of Viaticum. The celebration of marriages is forbidden, as also the celebration of other sacraments, except those of Penance and the Anointing of the Sick."

If your priest thinks he is forbidden to hear confessions during Triduum, he is sadly misinformed.