My point about Covid19 vaccination during chemo, is that it may provide a false sense of security. As vaccines do not work well while a person is on drugs that impair immune function.
If you are currently doing chemotherapy (not to be confused with hormone therapy), then, the chances of you developing a meaningful immune response (which is the mechanism by which a vaccine is effective) is very low to nil. And it’s Highly likely that the vaccine will need to be repeated 6 months after one concludes chemotherapy.
If you decide to get a vaccine during chemo you’d be wise to take prevention measures (wear a mask/ wash hands/ avoid crowds) as if you hadn’t been vaccinated.