Earlier quoted context omitted.
Let me summarize: 5,000 chemical warheads were found in Iraq after the war according to the New York Times, backed by video testimonials and documents. Also, ISIS stole part of the Iraqi chemical stockpile and used it against the Kurds. Sounds to me like there was a huge misconception that no WMDs had been found in Iraq https://www.nytimes.com/interactive/2014/10/14/world/middlee...
I read the article (that you cited and misrepresented to fit your predetermined narrative). The article discusses chemical weapons, not nuclear warheads. These are fundamentally different. And the reporting actually contradicts the original WMD justification. It explicitly states these were abandoned 1980s-era weapons, not an active program as claimed pre-invasion. So your summary is WRONG. The reporting actually und…
Furthermore, the conventional wisdom that you echoed, is that no WMD were found in Iraq, this was found a decade later to be completely false. Iraq did not disarm and had huge stockpiles during and after the 2003 war.
Iraq did not only undertake to disarm the program (which was also partially active), but also to destroy all chemical weapons, it breached the UN disarmament program by not disarming, which makes the pretext valid.
We can discuss whether it was smart for the US to invade Iraq, due to the subsequent changes in the Middle East that was also a plausibly correct move, but that's more complex than I can discuss in a single paragraph