All that's going to tell you is what "works" and what doesn't within the very limited context of human experience. Functionality may be a part of the truth, but it's certainly not the whole of it. And partial truths are not truth, they're just relatively factual bits of information (true or not true depending of their relation to other relative facts).
The Truth is beyond the reach of the human condition. Once we humbly accept the fact of our reality, we can begin to pursue that which we CAN achieve, and that is relative honesty.
I think the issue is how we look at truth.
If you removed all humans from the Universe, it would still follow the natural laws, these are independent of whether we are here or not. Again assuming that we don't live in a simulation or illusion etc. And even if we did, there is no logical reason to even care about it.
These are what you can refer to as the "real" truth. What we can do is perform experiments of these and through that get a better understanding of what they are.
Again its very important to take into account that we are never talking about absolute truth here. But merely what is
reasonable to believe as being the truth and what is not, based on our current knowledge.
But the "real" truth does not care, whether or not we understand it or not. It will work the same way regardless. So our experience of it doesn't matter either.
To use an example like the spherical Earth vs a flat Earth. What we are trying to figure out is not the absolute truth, but what is reasonable to assume is the truth.
So we perform a lot of experiments and all the tests and data etc. fits that of a spherical Earth, but the majority doesn't work on a flat Earth.
So assume we perform 1000 experiments...Of these, 1000 works for a spherical Earth and 50 works for a flat Earth. however looking at the 50 that works for a flat Earth, we can explain why they would work for both the claims. Based on these experiments and the results, it is not reasonable to assume that the Earth is flat and it being the truth, compared to it being spherical.
But again, no person on Earth, can know whether or not, the Earth doesn't actually change shape the moment we do an experiment or take a picture of it. But it is simply not reasonable to assume that is the case. If people believed that, it would be pointless to do science, because how would you proof to me that, the Earth doesn't in fact change shape every time we try to measure it, and therefore my claim of it being flat, is just as good as yours, despite all the experiments pointing towards it being spherical.
And that is why I call it a philosophical mind game, which is completely irrelevant. Because even if it were the case that it changed shape, we can't ever know anyway, so there is no reason to assume or take that into account when we are talking about, what truth is and what it ain't.
So again we are
not working with absolute truth, but what is true based on what our current knowledge tells us, and therefore what is reasonable to assume is the truth.
More to the point, what do you want to believe? Even if the universe didn't have my back, I would still want to believe in absolute truth. It's less madness and depression inducing.
My point is that it doesn't really matter whether we think there are absolute truth or not, if we allow for ideas, like we are being manipulated by some Godlike being, that interfere with things, whenever we try to seek truth, then we can never know for certain.
And obviously it is possible that such being exists, but we can't tell the difference anyway. So truth to us, is simply what we measure it to be, which then makes it reasonable to assume that one thing is more true, than something else.
Which is why, one have to be sceptical when it comes to claims. If there, is nothing to backup them up, it is simply not reasonable to refer to it as being the truth, even if that is how one experience it. What makes it closer to the truth is when evidence is thrown on the table. Especially if it allow us to predict things in the future, then its remarkable evidence, because the chance of it being exactly like that and so it fits our models are not that big. And if we can keep testing it and it is consistent, then there is no reason to assume that it is not closer to the truth than something else.