This makes sense to me.

Israel is leaving the battlefield in Lebanon. It has already begun to withdraw troops from north of the border, and plans to withdraw all of its forces when relieved by UNIFIL+ and the Lebanese Army. When that relief might take place is unclear.
What is clear is that Hizbullah's forces remain in place all over the disputed zone and that its command and control of its forces remains effective. How can you know that? Easy. The day before the cease fire Hizbullah fired 250 rockets into Israel and since the cease fire has fired none. This represents unmistakable evidence of effective command.
The IDF believes that Hizbullah is using the southward flow of returning refugees to infiltrate reinforcements and re-supply into the area near the border only partially occupied by the IDF. Between and among the scattered positions of the IDF there are many areas empty of Israeli troops. There are Hizbullah forces in these areas waiting for re-supply. The IDF must know that. Why are they vacating the battlefield in these circumstances?
A basic lesson of history is that one must win on the battlefield to dictate the peace. A proof of winning on the battlefield has always been possession of that battlefield when the shooting stops.

Put this in the following context:

You can't separate these things from history. Other groups may worry about Hezbollah, but Hezbollah knows that they are the only thing defending their people. I really don't understand why people have such a hard time understanding this.
Put yourself in their shoes - you spent EIGHTEEN YEARS occupied by a foreign power. The people who didn't help you, indeed who fought a civil war against you at the same time - the Christians, Druze and Sunni, want you to disarm? The ones who live north of the Litani, and won't be occupied if Israel invades again?
The Americans want you to disarm? The ones who sent in Marines, then used their navy to shell your villages, then whined that you were terrorists when you killed their troops and their spy chief? The French want you to disarm - the French who did nothing to stop Israel's invasions either time except spin uselessly around in the UN?
Think about how crazy that sounds. Really, think about it. If Hezbollah disarms what's to stop Israel from invading again? If Hezbollah is destroyed, who is going to run the hospitals, pick up the garbage, take care of the orphans and run the schools? If you're a poor southern Shia who hasn't seen government services in over a generation, why would you trust the government to take care of you?
I wouldn't disarm if I were Hezbollah. And if someone - Israel, the US, the UN, or the Lebanese who were shooting me in the back when I was fighting Israel in the 80's and 90's wants me to disarm, they can take my gun over my dead body.
But that ain't gonna happen, because after kicking Israel's butt twice, everyone knows who would win that confrontation. The Lebanese army is a joke.

You can see why people are looking at this as a kind of watershed moment.