I think “Capitalist Eric” is a liar or a tin foil spouting propagandist. The paper he quotes as justification for what he claims says absolutely nothing about engineering of this virus, at least in my quick read of it. In fact, they claim some of its characteristics are an example of convergent evolution, not deliberate engineering.
“This furin-like cleavage site, is supposed to be cleaved during virus egress (Mille and Whittaker, 2014) for S-protein “priming” and may provide a gain-of-function to the 2019-nCoV for efficient spreading in the human population compared to other lineage b betacoronaviruses. This possibly illustrates a convergent evolution pathway between unrelated CoVs. Interestingly, if this site is not processed, the S-protein is expected to be cleaved at site 2 during virus endocytosis, as observed for the SARS-CoV.”