Earlier quoted context omitted.
You didn't address what parent said at all. Parent said all COVID-19 research should be freely available to all as a matter of principle. What China does or doesn't do has no bearing on this.
Doesn't the origin and initial spread of the virus fall under COVID-19 research? Is it fair and ethical to ask country A to make free all research while being okay with country B hiding its own research on the same subject? Let us not whitewash unethical behavior with broad strokes of "freely available to all as a matter of principle."
This isn't about countries. I think it is unethical to hide research when it could save lives. If country B is hiding research, that doesn't mean country A should hide it as a revenge, and that doesn't mean the residents of country B deserve to take the brunt of the actions of their government policies. The civilians of B and the civilians of A deserve the best of science equally.
The virus doesn't care about where country borders are drawn. Even in the above situation where country B is hiding their research, if country A shares their research with B, it helps country A themselves because country B's people may be inoculated much faster and immigrants from country B to A will not be carrying the virus anymore.
The objective function that should be optimized is getting the virus eradicated from the world ASAP. There's a good chance that only some fraction of the world needs to be inoculated with a vaccine before the virus is nearly eradicated, and that will only happen if the vaccine is shared across borders. A good start, for example, would be to inoculate everyone who wants to take a flight or train, inoculate all doctors, and inoculate all service industry personnel, regardless of which of the 200 countries they are a citizen of.