2020 was still very much in the projection stage, the numbers got adjusted constantly until a good representation was agreed upon.
For example, one of the first "Covid-deaths" in my area was an 87 year-old man on palliative care for stage 4 pancreatic cancer. He died, they ran a post-mortem covid test on him, it came back positive. Later on, he got removed from covid death statistics as it was probably not covid that killed him.