The author of this apparently has no idea what a truther is.
The truthers do not believe that the US used the WTC hit as an excuse to start a war; they believe that the whole event was fraudulently represented as having been done by Arab terrorists, when all the while it was staged by US operatives.
Truther is the wrong word here.
That is MIFO truthers. There are also LIFO truthers that this falls into (see note a few above yours).