Still waiting for your response.
Just to be clear, they did not say "This will prevent the spread of SARS-Corona Virus 2". They also did not say "This will NOT prevent the spread of SARS-Corona Virus 2". From this I infer that the "vaccine" was not intended to prevent the spread.
What they did say is "This will lessen the severity of the Covid-19, should you come down with it".
Because this was two years ago, no, I cannot provide a specific citation.