Very interesting. Does that mean Covid was in Europe 3 months before the supposed patient zero in Wuhan (December 8?)
Sorry, but this would be pretty insane. Most likely explanation is probably false positives or scientific fraud or a combination. Antibody tests don't really prove much anyway since they are not directly identifying the virus. A full sequencing of a virus would be much better. The RNA would also give us information about the evolution of the virus.