I personally know about a dozen people in London who have had probable Covid-19, including myself. None of those cases were ever actually confirmed by testing or "reported" to anyone.
Swine flu was going around this winter, which also will knock you out for a month. If you didn't specifically get a coronavirus PCR test positive, there's about a 10:1 chance that what you actually had was the flu. Outside of major hotspots like NYC and Chelsea MA, I believe the serological studies that suggest about 2-4% of the population has had coronavirus.
I have no idea where you came up with this nonsense, but if anything there are academic studies demonstrating that, even in countries that do a honest job reporting covid19 deaths, Covid19 deaths have been systematically underreported.
There's by now a whole lot of people, including many experts in many domains, who are concluding the lockdown will kill more people than the disease itself. Far more if it turns out they had little impact, which there is also quite some evidence of.
And consider that heart attack and stroke centers are seeing precipitous drops in patient referrals, almost certainly meaning that the fear of catching COVID-19 is causing many people to avoid treatment and die at home: https://www.washingtonpost.com/health/patients-with-heart-at...
EDIT: Hey hey it looks like some information is finally coming out, and what do you know, it supports the idea that milder cases don't develop IgG antibodies as often: https://www.biorxiv.org/content/10.1101/2020.05.21.108308v1
Unless you want a source that many cases are asymptomatic, in which case you can easily google that yourself.
Have you had high fever and anosmia (lack of sense of smell) or maybe difficulty breathing?
If yes it probably was Cv19, if not, probably no.
Lingering symptoms for a week or so afterwards: “shortness of breath” feeling with slightly sore/tingling chest (but no congestion, snot or phlegm), mild dry cough, all-over muscle aches, feeling much more tired than usual, and sleeping longer than usual. I did not notice any loss of sense of smell.
It might be worth getting an antibody test if it's suspected.