which is why I said “this is how it has been done for decades”

Ok? At what point in the last several decades has a candidate won the primary, then bowed out right before being confirmed by delegates? What time in history can you point to to show that the DNC is doing something nefarious here by voting for the person the winning candidate endorsed before backing out?

This is an unprecedented event. The fact that you think it should have gone some other way is completely irrelevant.