So, Spain is acting on extrapolated data, and not actual data. That is always dubious, unfortunately.
Yes, it is true, people who go to the doctor get counted as cases but there is a constant claim that Covid-19 and the flu are one in the same. They are not.
The flu normally kills 12,000 to 79,000 in the US alone. Covid-19 has killed an approaching 100,000 people. And we're barely past a fourth of the year. Scientists were saying that the virus may dissipate in warmer weather but new information has emerged that due to the fact that the virus is mainly spread by droplets through mouth and nasal passages to other people, it is far more likely the virus will continue to spread through the summer and double come the fall.
Since we do not know how many people are infected, we cannot count them as part of the calculation. They are an x-factor. Those who've been tested, and tested positive, are continuously showing a higher than average fatality rate. True, if more people are infected and the parameters of Covid-19 are rigidly defined, then the virus is not as deadly as purported.
But ask yourself this, are you willing to take that chance? I appreciate skepticism. Especially from the perspective that you, yourself, could be wrong. That is how you prevent confirmation bias.