As others have mentioned, the early studies showing 0.1-0.3% have almost all been retracted or left unpublished due to significant errors. The issue was that many of the initial antibody tests were rushed out and were later found to have much higher false positive rates than initially thought, combined with surveying areas with low infection rates. That combination meant that a vast majority of positive tests were false.

The antibody tests are now more understood, and there have been studies done in areas of high infection rates, and those have all pointed to 0.5-1.5% infection fatality rates.

Going forward, as we develop better treatments and protect our vulnerable populations better, we should hopefully see that rate go down closer to 0.1%-0.3%, but the evidence so far shows we aren’t there yet.