That is a fabrication that goes boldly against everything we know. If Hamas layed down their arms, the Gaza population would still live in an open-air prison, with no access to anything that Israel doesn't want them to have. It's very likely that Israeli settlers would start stealing their land like they do in the West Bank, with help from the IDF and enthusiastic support from the Israeli government.
It's telling that Netanyahu and most others in the Israeli government, and the general Israeli public, have been explicit and consistent for at least a decade: they see no future for Gaza and the West Bank different from the present. A two-state solution is unacceptable to them, and an integration of such a large Arab population into a single Israeli state would undermine the Jewish character of Israel. So, if the Palestinians put down their arms, they'll continue to live as a stateless people, without the right to leave the territory except at the whims of a country they have no say in. Basically, they'll live as prisoners, as will their children, and their children's children.