I guess it’s possible. Hadn’t heard that one before but now that you mention it... But I was referring to the antibodies, which may or may not be differentiated from other spike protein antibodies. I just don’t know enough about the tests or the antibodies to answer.
One young doctor who died after vaxxx had 2 different kinds of antibodies.
One to covid which he apparently had or been exposed to earlier,perhaps asymptomatically, and another to whatever resulted from being vaxxxed
It would be impossible to distinguish the S protein antibodies considering they’re nucleotide-for-nucleotide identical copies from the viral RNA. It would be like trying to distinguish lab-made hydrogen from “natural” hydrogen: at that level, there’s nothing to distinguish since you’re just talking about chemistry.
The one place you can distinguish is looking specifically for N protein (nucleocapsid) antibodies. Those antibodies will exist in those who’ve had a COVID-19 infection, but not in those who’ve only had a vaccine. They aren’t targeted by the vaccines because earlier research from SARS-CoV-1 (SARS2003) showed that nucleocapsid antibodies are sometimes sub-optimal, leading to a risk of antibody-dependent enhancement (ADE). For all the wild claims of the vaccines causing ADE, they’re specifically targeting proteins where that doesn’t happen, which means if you’re worried about ADE, you’re better off getting vaccinated versus getting infected with SARS-CoV-2.