That's the official number as reported by hospitals around the world. There's news interviews out there for example, of folks who own property along the Ganges river in India who for a while there morning chore was to pickup all the dead bodies that floated up to their property during the night.
Another I remember is a girl / young lady in Bangkok pleading on Youtube that she is unable to find a hospital bed for her mother who had Covid. Kept calling all the hospitals everyday, and they always told her don't come because there's no room. She was fortunate enough that a volunteer organization dropped off a bottle of oxygen to their house, but they could only give her one canister because oxygen was in such high demand at the time.
Plus tons and tons of other stories like that.
I think it's pretty safe to say Covid has claimed more than 5 million lives. Not that it really matters any, because if the weather keeps going the way it has been in the past couple years, we're all in for a rude awakening.