Yes. (You meant V, not XOR, right?)
More specifically: there was a guy called Sakyamuni, he taught students, many years later what he had said was compiled into sutras. Also there are stories - some called sutras, some called other things - that we can't easily place into the mouth of someone called Sakyamuni. But that's not the point. We don't do justification by faith in the Buddhadharma. The question we should be asking is not, can I trace this historically to one person - because even if you could, so what? The question we should be asking is, does it work: does it help us to attain liberation. And there are many excellent texts written on how we gain that kind of confidence, for instance, by trying it and seeing the results, by relying on people we consider authorities after evaluating their experience and credentials, etc. We're not historians or theologians, though we might take a passing interest in those areas if it helps us understand better our practice. If our practice is dependent on whether we can establish whether some person a few thousand years ago said a specific thing, then we've completely missed the point.