Debating the legal niceties never helped anyone but lawyers.
Of course phosphorus weapons are legal battlefield weapons, but that gives Israel absolutely no moral right to use them in the densely populated Gaza. Criminal. And they’ve been doing it continuously since December. Criminally cynical too for Israel to launch this offensive over Christmas and New Year and whilst the US administration is in limbo. The UN effectiveness must be strengthened to balance these Christian / US weaknesses.
How does Israel expect any case it has for Levantine lands to be taken seriously when it acts like this ?