This is profoundly unserious foreign-policy analysis (as usual) from Richard.
First, the 20% of Gaza controlled by Hamas includes most urban areas.
Second, the claim about territorial/security control means much less than Richard (who knows exactly nothing about military issues, despite his endless pontification about it) thinks.
During the Iraq War, at the height of the insurgency in 2006, the various militant groups in Iraq controlled "only" about 20% of the country; yet they weren't close to being defeated before the Surge/implementation of the Conquer/Hold/Build Petraeus strategy.
This leads us to the key issue: does Israel control all the 80% of Gaza over which Hamas lacks control? It does not. Instead, a vacuum/effective anarchy remains over much of this territory.
If IDF fails to destroy Hamas - which it will - and the war ends, Hamas will be poised come back to govern Gaza. Happily, Hamas appears willing to give up governance of Gaza. But a deal for this would require Israel to end its so-called "war" in Gaza; not pause the genocide, but end it.
Hamas security official tells the BBC that Hamas has lost control of 80% of Gaza.
“About the security situation, let me be clear: it has completely collapsed. Totally gone. There's no control anywhere.”
Critics of the war told us this couldn’t happen.
Time for new leadership.