If your house catches on fire and the fire department tells you to evacuate, you are not being expelled. Gazans can come back north after the military operation. They aren’t even being forced to leave at all - it’s just a really bad idea to stick around where there will be city fighting.
Words have actual meanings.
Palestinians held zero land in 1968 because they never had any land in the first place. Also you mean 1967, or maybe 1966, if you mean while the area recognized as Palestine when it was currently Egypt and Jordan, respectively.