That part does not make sense to me. Why would Crazy Nancy not want to do the full monty on this?
Despite what they may say publicly, they very much want his concession. Otherwise, you can't marginalize those who refuse to recognize Biden as the "President". You are going to have 75 million Americans who look at "President" Biden and simply shrug their shoulders; if President Trump doesn't recognize him as the winner, why should any of us?