Under the law, Biden was nominated by the duly qualified Democratic National Convention, as recommended by Obama.
Thanks for your advice.
Actually, you’re both wrong. The Constitution doesn’t recognize political parties or their procedures.
Only the electors, as determined by state law, count. How the electors decide to vote is entirely up to them, and they can in theory elect anyone they decide is qualified.
Somewhat of a legal fiction, to be sure, but it is still true that nominations by parties are quite outside the constitutional provisions.