People like this are only referred to as straw men by the truth movement.
The formal definition of the straw man fallacy is when a person ignores a person's actual position and substitutes a distorted, exaggerated or misrepresented version of that position. For example, if I say, "There's no evidence of complicity by the Bush administration in the 9-11 attacks", and a truther replies, "How can you defend everything the Bush administration does? You're clearly biased in their favour", then he has committed a straw man fallacy, because I have not defended any actions taken by the Bush administration.
The truther definition of the straw man fallacy is a little different. To many truthers, any view held sincerely by another member of the truth movement, not held by them, and with logical flaws that are then exposed by a debunker, is a straw man. For example, Popular Mechanics was accused of committing a straw man fallacy for debunking the "Missile pod under flight 175" myth. However, the pod theory was not invented by Popular Mechanics as a misrepresentation of truther theories, but was a major subject of the video "In Plane Sight". The accusation of a straw man fallacy was therefore itself a fallacy.
So Ace's no-plane theories are sometimes referred to as straw men by other truthers, but only fallaciously.
Dave