It’s an incredibly ignorant post. Vaccines have additives. You have to study each additive abd determine whether it can get to breast milk before you reach that conclusion.
I think you are responding to the wrong post. My post was disagreeing to the post that suggested that the vaccine could not enter breast milk. If it can enter the blood stream it can enter the breast milk. It is a small molecule which makes it easier to enter the blood stream.
I did not even address additives, as you say depending on the additive & depending on the injection mechanics which can inadvertently enter partially into the bloodstream, secretion into breast milk cannot be excluded even if some might call it unlikely.