0. Chinese were disinfecting air with biological warfare agent fighting disinfectant from mass spraying cannons in trucks (=insane panic moment for an airborne something)
1. It binds to ACE2. People react differently to blood pressure crashes.
2. The viruses mutate all the time. Evolution dictates less deadly mutations take over
3. We don't have an isolation of the Wuhan sequence., just what the Chinese published
4. Chinese mortuaries and incinerators were working overtime 24/7
5. Tens of Thousands of relatives came to pick up ashes after the Wuhan lockdown

It is highly likely something big and serious went down in Wuhan.

What it was exactly, we may never know.