These dudes were saying that China could have prevented the pandemic but they choose to let flights out of Hubei a day before the quarantine.
A cursory look through Wikipedia shows that international cases were confirmed well before Wuhan was locked down. So my workmates are full of shit, right? Sorry, I don't follow this thing closely.
Sorry for making you have to listen to more anti Chinese bullshit.
As a general rule of thumb, whatever people accuse China of doing, assume the US is actually doing. China did some dumb shit to spread COVID? That was the US. China is genociding muslims in Xinjiang? Nope, the US is genociding muslims in the ME and Guantanamo Bay.