Black spot on leaves of Photinia Red Robin

My son in law has a Red Robin tree in the garden of his recently bought house in Swords, so we can’t tell how old it is. It is about 8 ft tall. He asked me about it today as it has black spot on the green leaves and the new red leaves are shrivelled and crispy, but not falling off. The spots are black and not red which makes me think it is not the disease that this tree can get. Could it be from the recent cold winds or frost? Would appreciate your advise.