From edition.cnn.com/2024/08/19/…/index.html :

Netanyahu shot back, saying Israel will not be “giving in to Hamas’s demand” to end the war in Gaza as a condition of a deal.
“The Prime Minister has strongly insisted on this fundamental demand, which is vital to achieving the goals of the war, and Hamas changed its position,” a statement from his office said Sunday. “The Prime Minister will continue to work on advancing a deal that will maximize the number of living hostages and which will enable the achieving of all of the war objectives.”

But even from the article you’re citing : axios.com/…/hamas-rejects-us-ceasefire-hostage-pr…

More specifically, Hamas objects to the fact that the proposal doesn’t include a permanent ceasefire or comprehensive Israeli withdrawal from the Gaza Strip.