The chances of the CCP releasing a self-harming bioweapon in order to harm the US seems silly. But an accident involving a well-intentioned gain-of-function experiment seems quite possible and was something that the US was concerned about with its own gain-of-function research.
In any case, this, like so much of this other nonsense around Covid [lockdowns in Contra Costa County when the major hospitals were empty-ish; no gradual escalation of lockdown given mid-January knowledge of Covid], seems pretty amenable to a calm, clear analysis...
Hypothesis | Evidence | Likelihood
------------------------------+----------------------------------------+-----------------
CCP Virus | [That'd be 360 degree dumb of the CCP] | *low*
Gain of function lab accident | [Existing concerns and experience] | *moderate*
Zoonotic transfer | [No likely vector for extant virus] | *moderate-low*
Doesn't seem too difficult...