Plenty made that claim but so far there is no way to know if that’s what happened.
Depending on the type of WMD involved we should have found evidence of it remaining in Iraq. Precursors, manufacturing equipment, a lab properly configured, something like that. The only WMDs we know Saddam definitely to have possessed are chemical artillery shells.
The problem with most of the WMD claims leading up to Gulf War II is that they came from Ahmed Chalabi who turned out to be a con man.
I’m sure they were there.
Remember Hans Blix and all the theater about searching for these weapons?
Remember how the places he searched had some kind of notice a day or two prior and then voila! no WMD.
Of course they were moved.
Remember Whoraldo Rivera drawing troop movements in the sand on live teevee?
I’m still mad about that one.