The very point of such specific and deliberate choices is to show that what we think we know from the record—i.e., from TOS and the other shows, especially as collectively (sometimes selectively) digested and passed through fandom up to this point—isn't necessarily the way it really happened at all. The record we "know" is wrong in some places, or at the very least incomplete and inconsistent. The record has outright lied at times and subtly obfuscated and obscured at others. Yet the point is not to invalidate or ignore TOS and the other shows, but to subvert our assumptions about what we see there and force a reinterpretation of them in light of new context. It's addition, not subtraction. The record, for all our careful study of it, has left us ignorant of much. DSC is here to fill us in on some of what we've missed and set us straight in some of our misconceptions...one such misapprehension being that we can trust the record.