There has been plenty of evidence of the lab origin of the coronavirus from the beginning of the pandemic.
Fauci’s was emails show that he was complicit in the China-lead campaign to reject the obvious source of the virus. His false statements to the Senate that denied his involvement in funding the Wuhan lab’s gain-of-function work is part of the same pattern of behavior.
There have been multiple defectors who have personal knowledge of the planning and response of the Chinese government to the release of the virus.
Most of the news media and scientific journals are owned by multinational corporations with massive business exposure to China. They have been doing their best to suppress the obvious. The billions that went to the Biden family from China does not hurt either. Money talks.