As seen above, Hamas & everyone else had agreed to it
Well, your second link says this;
The diplomats and officials stressed the ideas that had emerged from the UAE talks lacked detail and had not been distilled into a formal, written plan nor adopted by any government.
Your third link says this;
Officials in the PA acknowledged that the agreement does not guarantee the Palestinian [Authority] any involvement in the Strip.
Wiki summarises the phase 3 oversight as follows
Hamas would not rebuild its military capabilities
Your first link is dated 17 Feb 2025 - the same date as this CNN article in which a different Hamas official says this;
Hamdan also said the idea of Hamas disarming is not up for discussion. The group “was not erased” by the war, he said, adding that it will regroup and continue “and I am telling you, we have an opportunity to expand.”
Hamdan added that the region should retain the ability “to slap Israel whenever it wants… as we proved on October 7,”
https://edition.cnn.com/2025/02/17/middleeast/hamas-will-not-disarm-gaza-israel-intl/index.