It all still remains circumstantial and all of what this author is saying is pointing out possibilities in an opinion piece, looking at existing evidence.
But let me add something else to fuel this fire. The Chinese discovered and sequences this virus in record time. They knew very well and feared its potential so much so that they took extreme measures to suppress it and managed to do so.
Some other countries were slow with much more disastrous consequences. Does this mean that the Chinese new more about the virus from the very beginning than they let on?