The existence of an illegal phony state from a piece of Eretz Yisrael full of only Arabs and no Jews called "Jordan" (formerly Transjordan), vs. The existence of an illegal phony state from a piece of Eretz Yisrael full of only Arabs and no Jews called "Palestine" makes no difference except the benefits of using the second name erase the supposed "need" to create a "palestinian state" out of Israel's current territory, as that state has already existed since the british created it, and it is a majority fakestinian population in fact, ruled over by imported bedouin Hashemite minority if I'm not mistaken. So I think it's a great idea to acknowledge that the Fakestinian state already exists and has existed for decades (illegally), even if we are not giving it legitimacy and importantly not saying that it doesn't belong to us. We also are not saying Jordan doesn't belong to us even if we acknowledge Jordan exists, which everyone does today, so nothing is lost there.
Geert's idea is in line with that of Israeli politician Benny Elon - the Jordan peace initiative. And I think Elon had support from Aryeh Eldad and other prominent rightwing figures including even some US congressman who were impressed with the idea.