This does not sound good to me. If this is truly an invasion and they are planning a long and protracted campaign to rid Gaza of Hamas, I’m afraid the cost will be high for the Israeli forces.
If there is really a significant ground invasion I don’t think Israel would stay long. I don’t really think they want to put boots in Gaza, but it’s probably necessary if they want to blow some of the hard to get at tunnels and kill targets placed in civilian areas.
I doubt the goal is even to eradicate Hamas, just degrade it to the point they aren’t a real threat for some time into the future.