Of course it’s still a lie. But if a weak mind believes it to be true, then that weak mind won’t see it IS a lie and therefore perceives it to be true.
Think about it. The author isn’t saying it ISN’T a lie. He’s saying to people who believe the lie believe it is the truth.
Think of all the weak minds who believed the many lies the Deep State wove about Trump and they “know” they were true. Think about all the weak minds who believe the “systemic racism” and the “US is a racist country” lies and they “know” those are truths.
I stopped at the title. d;^)