You absolutely do not know that.
Hyper-partisanship leads to strange behaviors in hyper-partisans. We know that two other women lied about Kavanaugh behaving inappropriately toward them. Allegations such as these happen all the time in these confirmation processes, but we never hear about them because they're either lies or unprovable. All that was left for Kavanaugh was Blasie Ford's unprovable allegations. Given what we know about it, it should never have been made public in the confirmation process. Could have been a lie, could have been a false memory (my wife and I have argued about differing memories about important events in our married life), could even have been true or partially true, but clearly unprovable. Feinstein could have had it investigated soon as she was informed of it if she thought there was any merit to it. She didn't and the Democrats decided to make a circus about it instead.
Hyper-partisans on both sides are capable of making false claims. Look at the Tumpsters and the ridiculous claims of voter fraud. That's very much in the same vein.