One big difference is the Israelis fight in a lot of densely populated and residential areas against fighters that do not wear uniforms. The risk of incidental damage is high.

The steppes of eastern Ukraine are not densely populated, and Russian soldiers are easily distinguished from civilians by their military uniforms. The risk of incidental damage is low.

Man, the first link contains no information other than a link to the second link with some quotes from it. Not sure why you posted the first one if you were going to post the second link, since the first one is literally about Amnesty having posted the second one.

The second link is based on a post hoc analysis of two cell phone videos, but doesn't show them. Says they "appear consistent with white phosphorous." Says nothing about any chemical tests being done. Shows photos of smoke screen weapons, probably containing small amounts of white phos, being airburst on trees. They quote a doctor who treated exactly three people for shortness of breath and pulmonary irritation, consistent with exposure to white phosphorous, or any smoke, dust, or seasonal allergens, even.

Third link talks about photos showing airbused munitions being used as smoke screens. Same sort of innuendo and conjecture.

Second and third links obviously begin with, at the very top, almost first thing on the page, solicitations for donations. Surely they benefit from the sensationalized half truths.

In actuality, WP is perfectly legal and effective for smoke screens and signal flares, and while they loosely imply it, the articles contain no allegations, let alone evidence, in any of these links, that WP was used as an illegal incendiary weapon on people, which would be a war crime.

The articles are all very careful to talk about how it was used as airburst, smoke screens and flares, and talk about how it could be used as incendiary, but none state that it was. This is the typical coverage of anything to do with Israel.

How do you fall for it so easily?

Should ban yourself for misinfo.

Edit: oh, the first article does contain one piece of additional info:

Dheira, a town of 2,000, has become a focal point for fighting. Just across the border from an Israeli radar tower, it has been used as a staging ground for Hezbollah’s attacks against Israel. At least 94 people have been killed on the Lebanese side of the border since tensions escalated, according to data released on Dec. 5 by the country’s Health Ministry — 82 have been militants, according to Hezbollah. In addition, at least 11 Israelis have been killed, most of them soldiers.

Obviously Amnesty would never describe the circumstances for why there is fighting in the first place, so only named the town.

Why is everything about Israel?

White phosphorus burns at 1,000 F, whereas thermite burns at around 4,000 F. Not a step up.