It's also notable that he doesn't talk about the R0. I think most people are in agreement now that the overall fatality rate is somewhere in the range of 0.1-0.5% (notice how the doctor in the video seems incapable of saying "per cent" most of the time), but Covid-19 spreads far more rapidly than flu does. 0.1% of the population is still a lot, especially from a new disease that is providing a clear sign of excess deaths over the population.
Final criticism -- I simply don't understand how he can dismiss the clear difference between the outcomes and scale of disease in Norway and Sweden. There's an order of magnitude difference in deaths between the two, an order of magnitude difference in death rate as a percentage of population, twice as many cases in Sweden as in Norway, and the spread of the disease in Norway has significantly reduced. Sweden's remains on an upwards trajectory. All of this entirely undermines his case, and yet bizarrely he implies that it's "insignificant".
Were early projections overly pessimistic? Very possibly. By definition, since we've taken action in various forms, it will be hard or impossible to tell for certain. What *is* certain is that 200,000 people are recorded to have died, this is already an underestimate, and the progression of Covid-19 is continuing so that the "final" death toll will be higher anyway.
Healthy scepticism is important, but there was a reason for the pessimism, and it was right that we took the threat seriously.