The problem is that the leading test used to detect Covid over the past year is now known to have had up to a 90% false positive rate. So a lot of “Covid cases” were actually the flu or something else. These people have no natural immunity even though they were told that they had Covid.
There are a growing number of doctors calling this the PCR pandemic because of the complete bungling of the testing.
Also, the massive mishandling of patients, particularly the elderly, seems to have created a lot of the deaths. Often you see two countries that share a border, one had large numbers of excess deaths, the other had none.