I can't believe this was posted here, but I guess I shouldn't be.
This is a horribly written and titled article. There is a reason this article was posted in the "Tumori Journal" and focuses on "cancer science", with an impact factor of 1.7 (meaning little impact at all)
Quite simply, there is absolutely no evidence that these antibodies that the authors have found are "specific" to SARS-CoV-2. They are most likely cross-reactive to other coronaviruses that are commonly circulating within our population that infect us yearly and cause the common cold or no symptoms at all.
It would take a considerable amount of work to show that these antibodies are specific to SARS-CoV-2, none of which is shown within the article. The authors did a simple ELISA assay, which is only step one and will not determine specificity. They then followed with a microneutralization assay to show if these antibodies can actually neutralize the virus -- only 6 out of 111 samples could neutralize the virus to some degree. Not really "specific" at all, and confirms what they found was only cross-reactivity.
Be better about what type of studies are brought to the board instead of trying to post flashy headlines that you think confirm your biases.