This is no way exonerates the Wuhan government from possible culpability—indeed government officials did deliberately suppress information—but this investigative opinion doesn’t pass scientific muster. Misinformation.
Also it refused fiercely to let foreign experts in to investigate, which is also hard to explain other than something MUST be hidden at all costs.
A rational actor would take the opportunity to do this regardless of whether or not the source was known at the time. If it were even a possibility, you would hope they would use the outbreak as a reminder to take containment practices as seriously as possible.
Whether or not to allow foreign investigators is a political decision. Maybe they calculated it would appear as an admission of guilt or incompetence.
Let’s remember this is China we’re talking about. Before you hand wave that away, consider the emphasis that China places on keeping-up-appearances at practically any cost