He and the rest are talking about normal circumstances where the Muslim armies meet the enemy armes and the battle is restricted among the combatants (i.e., between the warriors only).
The situation here with Israel is specific whereby the enemy relies on mass killing of Muslim civilians as tool to create fear and as a deterrent. In these situations, the fiqh of jihad allows for the Muslims to target the civilians of the enemy, otherwise the enemy armies will have an upper hand and Muslims will be greatly disadvantaged and will likely lead to a defeat.
There is a trend among Muslims in recent times to propagate Islam as all lovey dovey, similar to the concept of turning the other cheek as in Christianity. This has been propagated by the ulama post 9/11 in an effort to reduce hatred against the Muslims, Islam was propagated as ALL PEACE and no fighting at all. People who are quoting some ayah and ahadith trying to prove they know the essence of Islam and it's all peace all the way no matter what the enemy does to us, these people are those who didn't dive into the subject.
General guideline:
It is narrated by Ibn 'Umar that a woman was found killed in one of these battles; so the Messenger of Allah (may peace be upon him) forbade the killing of women and children.
Specific:
It is reported on the authority of Sa'b b. Jaththama that the Prophet of Allah (may peace be upon him), when asked about the women and children of the polytheists being killed during the night raid, said: They are from them.
Above is an example only, there is far more.
@Oscar