There is a case to be made that insisting on alternative facts is trolling.
The person who believes fairy tales to be literally true and posts them as real and true will eventually encounter respondents who point out the falsehoods being posted for what they are. The responses will be rational and will point out documented facts that are contrary to and reveal the myths for the falsehoods they are. At some point, despite being given every reasonable opportunity to see the false posts for what they are, the myth-believer is shown to be willfully ignorant. Continued posting of the same falsehoods as real-world truths has a predictable outcome. Those posts serve only to disrupt an otherwise productive discussion. Posting falsehoods to be intentionally disruptive is trolling.
As to the question of whether or not such behavior should be actionable, that gets to the heart of the kind of forum community being built, here. It's been made clear that DPRevived will not be a place where it's common practice for members to be banned. That doesn't mean admins have to be without options to respond to members whose participation often has a negative influence.
For example, I've suggested that a flag tool be added allowing an admin or facilitator to flag a post in a thread as being a factually accurate response to the question raised by the OP. It's basically the DPRevived seal of approval. If this were put into effect, admins and facilitators would have a tool they could use to call attention to a particularly useful and accurate response. If admins have the authority to unflag a post, that allows for corrective action should a post of questionable value be flagged.
It's a practice that would address the issue of the member who repeatedly posts alternative facts in response to basic questions. It addresses this issue by allowing a correct answer to be flagged as such. It also would encourage and reward members for posting accurate useful responses to questions. It wouldn't be used in every thread nor would every useful response be flagged. Even if the flag tool were only used in threads where one or more members insist on promulgating known false beliefs, it would serve a productive purpose. And it would do so in a civil manner. Nobody's being called out for posting myths and falsehoods. It's just calling attention to an accurate and useful response.