To mislead by seeming to give proof to an unproven theory or conjecture.
Factualization is usually accomplished by highlighting the portions of a theory that align with the desired outcome of the factualization while omitting and/or downplaying the portions of the theory that do not.
Factualization is generally practiced by a lawyer, a politician, a con man and/or a used car salesman. A person who is proficient at the art of factualization is known as a spin doctor.
The speaker had some strong arguments which seemed to factualize his position that global warming is a hoax, even though he never mentioned that the polar ice caps are melting.