This article argues that the possibility of ADE (antibody dependent enhancement) was known by the developers who designed the vaccines to minimise this. I can’t follow these arguments in detail but it’s clear that the truth of the matter one way or other lies in whether there are or are not reported occurrences of ADE resulting from the vaccination programme. This article says that there have been no such reported occurrences:
“To date, there’s really no evidence of ADE with the COVID-19 vaccines. It’s all theoretical, … I think all the evidence so far is that ADE is not turning out to be a problem with any existing vaccines or viral variants.”
Others have argued, elsewhere, that people who have only had the first dose of the vaccine are empirically known to experience greater harm from Covid-19 than the unvaccinated. This would be consistent with the notion that the sub-optimal antibody response prompted by the first dose is can result in ADE.