Hallucination thought does fit.
It’s a term in the context of a source that implies untrustworthy, not authoritative and/or imagined.
Lots of examples in every day usage or scenarios that come to mind.
“And then I saw the defendant punch the victim and then I was blinded by the sunlight”
Are you sure you didn’t hallucinate the entire episode? It was night after all.
Or
“Somebody please get these ants off of me”
Doctor writes: Hallucinations of ants on skin