A link to the Al Jazeera article and video: https://www.aljazeera.com/news/2023/10/19/what-hit-ahli-hospital-in-gaza
A Channel 4 News investigation also confirms that Israel’s audio tape of “Hamas operatives discussing the rocket malfunction" is a fake with their experts saying that the tone, syntax, accent and idiom sound absurd and not credible: https://www.channel4.com/news/who-was-behind-the-gaza-hospital-blast-visual-investigation
This would also not be the first time that the Israeli government has lied about “misfired Palestinian rockets”: https://mondoweiss.net/2022/08/after-initially-blaming-palestinians-israel-admits-to-airstrike-that-killed-5-children-in-gaza/
The Israeli army has been trying to prevent international journalists and independent bodies from entering Gaza to act as independent investigators: https://www.youtube.com/watch?v=60EK-3-kGLI
I think that was just a special filter, not thermal. They just upped the contrast and changed the colours to make it easier to see the shrapnel