Is it an extraordinary claim? The sequence matching should be easy to verify as the genome has been published. If the sequences are short or common enough maybe it would be a more likely coincidence.
That said: What are the priors on a "natural" virus erupting in the only city in China with a level 4 biohazard facility?
Source: http://english.www.gov.cn/state_council/ministries/2018/01/0...