This guy is talking about antibody dependent enchancement, and I found a research paper examining this phenomenon with respect to vaccine therapeutics, published September of 2020 -
https://www.nature.com/articles/s41564-020-00789-5 Antibody-based drugs and vaccines against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are being expedited through preclinical and clinical development. Data from the study of SARS-CoV and other respiratory viruses suggest that anti-SARS-CoV-2 antibodies could exacerbate COVID-19 through antibody-dependent enhancement (ADE). Previous respiratory syncytial virus and dengue virus vaccine studies revealed human clinical safety risks related to ADE, resulting in failed vaccine trials. Here, we describe key ADE mechanisms and discuss mitigation strategies for SARS-CoV-2 vaccines and therapies in development. We also outline recently published data to evaluate the risks and opportunities for antibody-based protection against SARS-CoV-2.
They also go on to say this:
Evidence for vaccine-induced ADE in animal models of SARS-CoV is conflicting, and raises potential safety concerns. Liu et al. found that while macaques immunized with a modified vaccinia Ankara viral vector expressing the SARS-CoV S protein had reduced viral replication after challenge, anti-S IgG also enhanced pulmonary infiltration of inflammatory macrophages and resulted in more severe lung injury compared to unvaccinated animals66. They further showed that the presence of anti-S IgG prior to viral clearance skewed the wound-healing response of macrophages into a pro-inflammatory response. In another study, Wang et al. immunized macaques with four B-cell peptide epitopes of the SARS-CoV S protein and demonstrated that while three peptides elicited antibodies that protected macaques from viral challenge, one of the peptide vaccines induced antibodies that enhanced infection in vitro and resulted in more severe lung pathology in vivo67.
The fact is, we don't know exactly how this mechanism would work in relation to the Covid vaccine, and we also don't know the exact mutation rate of Covid. Covid could mutate into a form that kills the virus itself (known as a lethal mutation). Of course we don't hear about these mutations because they obviously can't spread. The vaccines are good against the Indian variants, we have no way to predict whether a future variant will appear and be ineffective against the vaccines. And we're also not sure if Covid antibodies from vaccines engage in the ADE mechanism. This guy in the video seems to speculate a lot.
