At some point they’ll have to give up the laboratory confirmed and settle on suspected. They can only test so many. If it keeps spreading they’ll eventually give up on suspected too as the infection exceeds reporting abilities. Eventually they may have to just say “F-it, all these people who died of sickness from the start of this probably died due to this outbreak”. That’s what’s been done in previous pandemics like the Spanish Flu. They just don’t have an accurate count.
Justa, agreed on all you said. They are SLIGHTLY underestmating case fatality for the reason you said, some folks are dying but not yet dead, but not as much as you may think. Most deaths occur within 8 to 10 days, and as time goes on this number becomes a smaller proportion of the total and gets effectively weighted out.