That sort of pattern could just as easily fit the virus originating in some remote village in Kazakhstan, getting passed on to Chinese citizens at a mine or construction site where lots of Kazakh labourers would be packed into close quarters in barracks, and then carried back to Wuhan some time in November or December by a Chinese citizen returning from a contract in Kazakhstan, who then passed it on to people working in the sea food market in Wuhan while shopping. That is a much simpler explanation than assuming multiple pandemics.As I've previously mentioned, Kazakh and Russian medical communities were reporting unusual numbers of serious and unidentified pneumonic illnesses as far back as spring last year. Given the nature of the regimes and clinical reporting standards in the region, I doubt WHO will be able to collate any meaningful data. However speculation in those medical circles is that C19 is actually the second or third wave of pandemic originating in China.
Significantly, China- Kazakhstan-southern Russia is currently a major transit corridor for trade and for Chinese commercial infrastructure - a northern branch of the old Silk Route. As expected, the predominant flow of people and goods is out of China, with little return flow other than Chinese nationals (Kazakhstan has a serious problem with its poorer people being economically displaced from manufacture, trading and jobs by Chinese nationals).
Hypothetically it could be a different variant of COVID-19, one that doesn't show up on the standard test. If we speculate that the virus originated in Kazakhstan (I'm not suggesting this is likely though), then there could be multiple variants of it circulating, only one or a few of which made it to Wuhan, and then on to the rest of the world. This latter variant would be the one our tests are designed to find.
The simplest explanation though is that what is being seen in Kazakhstan are just normal cases of COVID-19 being classified as "unknown pneumonia" due to limitations in testing. Other news reports have supported the idea that testing in Kazakhstan has been less than optimal. COVID-19 spread out of control in the US due to problems with lab testing (the test the Americans developed didn't work reliably), so there is precedent for that sort of thing.
The WHO are going to investigate along with the Kazakhstan authorities, and we'll see if there is actually a new virus or whether it's just COVID-19. As I said earlier, this is a story worth keeping an eye on. However, if I had to lay money on it being either a new virus or just problems with Kazakhstan testing, I would bet on the latter at this time.