Two ways to look at the recent acceptance of the lab leak theory by the MSM
1) China is in fact not responsible but for some reason the DC bugmen and their propaganda outlets have decided to go full press because reasons. This doesn't seem all that likely to me as there is just too much money invested in the Chinese economy and the corporate sector cannot countenance any restrictions in the flow of capital into China (the main reason they got rid of Trump).
2) This is a cover for something far worse. What could that be? Don't know but I have noticed all the media reports and the Biden administration statements constantly referencing "the possibility of an accidental leak". What if they had overwhelming intelligence that China, or some other state actor, released the coof on purpose? A good tell for a cover up is when confirmed liars start admitting the truth, but only part of the truth. It makes sense as the scientific consensus that the coof is man made is now overwhelming and admitting this allows them to cover up the bigger scandal which if it became common knowledge would lead to sanctions against the Chinese (costing them trillions).