Even in the real world 95% efficacy means someone vaccinated is ~20x less likely to spread COVID (two weeks after their second dose) than someone not vaccinated. Maybe even less likely if the 5% who aren’t immune have lower viral loads than someone not vaccinated.
Do they have data to show that? When I was reading about this a couple weeks ago, scientists/doctors were saying that they can't be sure about how much vaccination would decrease the spread. That is, they thought it was possible that there would be sufficient virus in the respiratory passages, such that a vaccinated person could emit them while speaking, singing, coughing, etc, and thereby transmit the infection, even though they themselves are able to fight it off. I agree with you that I think it unlikely, but not impossible.
The question is what we do with that information.
If your goal is to reassure anxious people that the end of the pandemic is near, then, yes, I agree, emphasize that it'll probably turn out that vaccinated people don't get sick and don't transmit infection.
If your goal is to prevent illness, then I would take the opposite tack, emphasizing that we just don't know yet whether vaccinated people can transmit disease, and what factors play a role in their getting covid anyway, and therefore they should continue to mask/distance until a much larger fraction of the population has been vaccinated.