I believe what he meant is that all your “truths” are the same as the believe in the example. You have reasons to believe that those things are true, and certain observations made by you corroborated your hypothesis, leading you to conclude they were true.

For instance, I have 5 fingers in each of my hands: you see them, you use them, so they must exist and be real. I’m no philosopher, but I suspect their arguments would go towards how can you trust your senses and perception to prove ideas about reality...