I agree. Moreover, the cited bug ("predictions varied by around 80,000 deaths after 80 days") doesn't really seem to impact the over all policy implications: no

I agree. Moreover, the cited bug ("predictions varied by around 80,000 deaths after 80 days") doesn't really seem to impact the over all policy implications: no lockdown means exceptional number (400 to 480k) of deaths. Unless the entire simulation is bogus, it comes off as nitpicking.