If “truth cannot be known” is a known statement of truth, then it shows truth can be known making the statement wrong. The statement renders itself nonsensical by its own claim, hence self-defeating. However, if a internally consistent statement is all that is needed to ascertain the nature of valid knowledge, how about “we may or may not be able to know truth.” There is nothing self-defeating here. The two reasonable answers to the question of whether or not we can know all truths is not “yes, we can” and “no, we can’t;” it is “yes, we can” and “it’s unknown.”
That’s it. That’s the post. I’ve previously said that evidence and experience inform essential truth while philosophical ideas make absolute truth hard if not impossible to see. It's worth pointing out that our ability to know one truth doesn't mean we can know any or all truths. I've also talked about the one truth that comes to mind that can be objectively determined evidentially by the relational language of math. If you want to know about that, go read those posts. Here I’m only making clear that apologists expose their ignorance by presenting the linguistic straw man of a self-defeating statement. If you are an atheist, please let every apologist know it’s BS. If you are an apologist, stop it. Just stop. You make it hard for us to take future arguments seriously with this crap. I know apologists you respect came up with this line of reasoning, but they shouldn’t make you respect a shitty argument more than it is worth. If anything, their shitty argument should make you respect them less.