The trick here, that was even covered in that paper, is the difference between what Palestinians think a one state solution is and what Israelis think a one state solution is.
In that study they found the Palestinians viewed a single country with equal rights for all as a one state solution. The Israelis thought it meant a state with all of the territory but without the Palestinians.
Frankly, the liberal Israelis wouldn’t be for a one state solution if it also meant giving up the land and property stolen from the Palestinians through terrorism.
“Scratch a liberal, and a fascist bleeds”
Watch how fast they’d turn right wing if property in west Jerusalem or east Jerusalem had to be given up.