Your source does not remotely support your claim.
> Assad finally freed the city from the terrorists
And Assad is not a terrorist? "We want democracy; here, have a bullet in the head instead".
That Wikipedia page says pretty clearly it supported the Free Syrian Army, and that some arms may have accidentally ended up with IS extremists. That is not the same thing as "helped arm, fund, and train" at all.
Nour al-Din al-Zenki seems to have gotten some support around 2014/2015. It's not entirely clear to me what the entire story on that is, and the LA Times article doesn't explain it either.
You are spectacularly misrepresenting your own links to the point it's exceedingly hard to take this in good faith.
Re:The Dead Children We Must See
by Georgelemental on Tuesday November 28, 2023 @10:40PM
(#38455249)
The LA times link doesn't tell much of the story, that's why I linked to Wikipedia as well.
(As for Assad—I am no fan of the man, he is a butcher, but still far better than Al-Nursa.)
https://en.wikipedia.org/wiki/Timber_Sycamore
For years, the CIA helped arm, fund, and train the "Al-Nursa front"—Al-Quaeda's official Syrian affiliate. Al-Nursa took over Aleppo, ran wild looting, raping, and killing. But when Russia and Assad finally freed the city from the terrorists, US condemned the liberators.