Lying means purposely saying something which one knows to be false.
There is a considerable body of opinion which would hold that using white phophorus as an anti personnel weapon would be prohibited.
None of these people is lying.
See here:
*"According to international law, any chemical used to harm or kill people or animals is considered a chemical weapon. In the words of Peter Kaiser (Organization for the Prohibition of Chemical Weapons):
“Any chemical that is used against humans or against animals that causes harm or death through the toxic properties of the chemical, ARE considered chemical weapons and as long as the purpose is to cause harm - that is prohibited behaviour.” *
The actual words of the Treaty are:
*"For the purposes of this Convention:
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“Chemical Weapons” means the following, together or separately:
(a) Toxic chemicals and their precursors, except where intended for purposes not prohibited under this Convention, as long as the types and quantities are consistent with such purposes;
(b) Munitions and devices, specifically designed to cause death or other harm through the toxic properties of those toxic chemicals specified in subparagraph (a), which would be released as a result of the employment of such munitions and devices;
(c) Any equipment specifically designed for use directly in connection with the employment of munitions and devices specified in subparagraph (b).
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“Toxic Chemical” means:
Any chemical which through its chemical action on life processes can cause death, temporary incapacitation or permanent harm to humans or animals. This includes all such chemicals, regardless of their origin or of their method of production, and regardless of whether they are produced in facilities, in munitions or elsewhere.
(For the purpose of implementing this Convention, toxic chemicals which have been identified for the application of verification measures are listed in Schedules contained in the Annex on Chemicals.)"*
White Phosphrus is a chemical, it is toxic, if it is aimed at personnel with the intention of using its toxic properties to harm humans through its toxic effect (which US forces have admitted - inhumanely but quite expectedly giving it a humorous and inhumane nickname- to shake and bake) then it is a chemical weapon. If it is merely used as a smoke screen or as a battlefield illumination it is legal, but if it is used as an anti-personnel weapon, then it is not.
So I can say quite clearly, used as an anti-personnel weapon, white phosphorus is a chemical weapon.
No lying there.