Alex Jones has blamed "psychosis" for his wild claims, which include that the Sandy Hook massacre was staged.
The Infowars host and conspiracy theorist, who was recently kicked off Facebook and YouTube, made the claim after being sued for defamation by families of the child victims.
Twenty children aged six and seven were killed in 2012 when a gunman opened fire at Sandy Hook Elementary School in Connecticut.
The families of nine of the victims are suing Jones for defamation. Jones has long argued the shooting was staged to spark a crackdown on the United States' remarkably lax gun laws.
Texas newspaper the Austin American-Statesman reports he's now claiming to have a mental disorder.
"I, myself, have almost had like a form of psychosis back in the past where I basically thought everything was staged, even though I'm now learning a lot of times things aren't staged," Jones reportedly said.
He blamed his alleged psychosis on "the trauma of the media and the corporations lying so much, then everything begins - you don't trust anything anymore, kind of like a child whose parents lie to them over and over again, well, pretty soon they don't know what reality is".
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But he still has suspicions about Sandy Hook.
"I still think that there was a man in the woods in camo... and just a lot of experts I've talked to, including retired FBI agents and other people and people high up in the Central Intelligence Agency, have told me that there is a cover-up in Sandy Hook," he said in his deposition.
Other tragedies Jones has claimed were staged include the September 11, 2001 and the Stoneman Douglas High School shooting of 2018. Two of the survivors of the latter recently took their own lives.