If China is messing with the data, why do we even have data that shows the epicenter of infection moving southeast? Why not just hide or falsify it?
Those are pretty naive criteria based on what we already know about the situation. One of the biggest opponents of investigating the lab leak hypothesis was Peter Daszak, a British zoologist who is certainly not Chinese nor does his EcoHealth Alliance have any surface level ties to the Wuhan Institute of Virology. EcoHealth Alliance provided grants for the coronavirus research (and the activity that has been labeled by some as gain-of-research) and authored the misleading Lancet letter [0] that was used to ostracize anyone who publicly disagree with the animal-spillover hypothesis as well as enabled social media platforms and fact-checking sites to censor any content or discussion of the lab leak hypothesis.
TL;DR: people can have agendas that may not be obvious to you at first glance.
[0] https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
My personal view is that it's impossible to know: the CCP has done everything possible to look guilty of hiding something, but unless there's some breakthrough where a source animal is found or someone in the CCP security apparatus makes a deathbed confession, I consider this an unresolvable discussion. That being said, I'm still 100% behind the shaming of people like Peter Daszak who have been shown to have acted in bad faith to cover their own asses.
You made no effort at all to criticize the methodology (which looks pretty standard to me, consistent with methods used to pinpoint the origin of other disease outbreaks besides COVID), or the raw data. Not one of the listed authors is Chinese, nor do any of them have any Chinese institutional affiliations.
What is your actual argument for why I should disregard this, beyond 'CCP bad'?