I would like to jump on the band wagon and point out that this is an absolutely minuscule shift in position.
From "we don't know if it was a lab leak or spread from the market" to "we think it maybe is". Sure, they started this investigation with Biden, but just released it a couple of days ago AND they have even low confidence on it. So, why release it if the confidence is low? Why now? The answer is: new government, new conclusions.