You aren't wrong. I'm not sure about the context here but using this type of weapon on infantry is normally considered a war crime. I really want to emphasize the lack of context but folks should know.
Edit: do you guys downvote all true things you find inconvenient?
Section 6.2 of the 1999 UN Secretary-General’s Bulletin states: “The use of certain conventional weapons, such as … incendiary weapons is prohibited.”
Antitank guns are legal, incendiary weapons such as the above are not. Napalm was made illegal against infantry through this but also antitank industry weapons.
It's not a war crime to use explosives on single soldiers. If it was then a claymore or other mine would be illegal also. This sounds like one of those things soldiers tell each other on the battlefield but isn't true, like 50 cal will rip flesh off a person if you fire it close enough. Or that it's a war crime to use 50 cal on people.
do you guys downvote all true things you find inconvenient?
I think people are downvoting the fact that you are insisting the "...incendiary weapons such as the above...", when the weapon is not in fact an incendiary, also according to UN Convention