Even assuming they'd do such a thing it doesn't make any sense to do a deliberate release on their own citizens. Chinese intelligence is good enough to do a sec

Even assuming they'd do such a thing it doesn't make any sense to do a deliberate release on their own citizens. Chinese intelligence is good enough to do a secret release on someone else's territory and even if scientists quite reasonably asked how the coronavirus in question had made it from China to say Brazil there'd be less political exposure. Doing it to themselves when they were manifestly not ready to handle the public health side would have been just plain dumb. I don't doubt that the morals and ethics of the ruling party could be that weak, I just don't think a China release of an COVID-like virus is an approach they'd see as worth it.