Can't be sure, maybe they get symptoms 2 days later but nobody thinks to ask them, or maybe they've had very mild symptoms they've not really noticed.
I barely noticed it, but pretty fit, felt a bit tired 4 days, 1 night of temperature and sweating and mild chest pain ( put down to heart condition ) while doing CV in the gym, wasn't until my mates all had it 2weeks later when I realised I'd had it.
Quite a lot of people kept it secret aswell, bit of a Stigma people suddenly become scared of you even 14days later and people don't want to lock themselves indoors for 14days, so some of above might be not wanting to get caught not self isolating.
UK have stopped updating this...
https://www.statista.com/chart/21079/coronavirus-cases-uk-map/
Was charting all of the areas, London was going down very early on when others where going up, but must be over they've closed the Stat's department down or don't want anyone noticing it's over, you choose.
Went from +6000 per day to +500 area over the 2months.
Dropping Social distancing I hear to 1Metre when the pubs open, although pointless because in doors with aircon/heaters running, will keep it airborne for ages anyway, and to help hospital wise no doubt.
You can see the US areas that'll continue higher, hopefully they'll be reduced enough to not put lockdowns on or atleast the release gets it around enough to not get a 3rd wave.