[jeroenhd]

A person can 100% believe in the lies they've been told, but that person is not hallucinating.

Take for example climate change deniers; apart from the corporations and the politicians that abuse scepticism to maintain their power and wealth, many of the most fervent deniers truly believe the nonsense they're saying.

Perhaps a more neutral term like "falsehoods" is applicable here.

[circuit10]

I think calling it lying requires intent, I’d just say those people are wrong rather than lying