This tweet is totally true, yet it does not quite convey the message you think it does.
Covid-19 is not a 'killer' virus. Ebola is a killer virus. The average mortality rate is 50% for Ebola. Rabies is a killer virus. Left untreated, the mortality is essentially 400%. Right now, the case fatality rate of Covid-19 worldwide (albeit mostly in countries with good HC systems) is 17%. Considering the likely high number of people who have had mild symptoms who haven't been tested, the real fatality rate is likely lower.
It is also true that it has moderate transmitability. The R0 of Covid-19 will differ based on the PH measures put in place but the average quoted is usually between 2.3-2.8 (this is the average number of people each person will infect). To again provide some comparison, measles is is somewhere between 12-15, Mumps about 5, Influenza usually between 1-2, chickenpox around 10. It does have lower transmitability.
So yes, I agree that the media reporting has not been helpful. It has added to anxieties, even for younger people with no co-morbidities who, for the most part, are left relatively unscathed by the virus.
What I think you have taken from this tweet is that 'This virus is not as bad as people think, everybody carry on'.
This is not what he's been saying generally or what he believes. It is not what most doctors or epidemiologists believe either. It is just the media reporting is incredibly unhelpful.