Abbas wrote his dissertation thesis about Holocaust denial. Perhaps he questioned the numbers, I have not read his Thesis as it was presented in Moscow. Anyone one who in the eighties would question the numbers of Jews murdered for his PHD is an obvious Anti-Semite. It still makes him a holocaust denier. He obviously could not completely deny the events and present such to a Moscow university who has documented the event at length.
Yemen's Houthi rebels commit to peace plan in letter to UN chief, BBC reports (Haaretz)
from the article: After his stint at UN, Abbas is politically stronger than ever