Seems like an odd thing to say. Apparently there is a WaPo article behind a paywall on his comments and their context.
I was able to access the article. I cleared my cache and cookies first. Not sure if that did the trick.
Here’s a look at Rubin’s fuller comments:
“This is a much tougher one, I think, than we had expected coming into it. The data show that this vaccine works and it’s pretty safe … And yet, we’re worried about a side effect that we can’t measure yet, but it’s probably real. And we see a benefit that isn’t that same as it is in older patients.”
“It’s a very, sort of, personal choice. If I had a child who was a transplant recipient, I would really want to be able to use a vaccine. And there are certain kids who probably should be vaccinated. The question of how broadly to use I think is a substantial one. And I know it’s not question, and I know we’re kind of punting that to ACIP.”
“But I do think that it’s a relatively close call. As Dr. [Ofer] Levy just said, and Dr. [Hayley] Gans said, it really is going to be a question of what the prevailing conditions are. But we’re never going to learn about how safe this vaccine is unless we start giving it. That’s just the way it goes. That’s how we found out about rare complications of other vaccines like coronavirus vaccine. And I do think we should vote to approve it.”
https://www.washingtonpost.com/politics/2021/10/27/an-fda-adviser-said-we-need-give-kids-vaccines-fully-understand-their-safety-heres-crucial-context/It’s important to understand what the FDA is considering here. If approved, it will not be forcing any children ages 5 to 11 to take the vaccine. It’s about giving parents the option. “When there is a declared emergency, the FDA can make a judgment that it's worth releasing something for use even without all the evidence that would fully establish its effectiveness and safety. If there’s evidence that strongly suggests that patients have benefited from a treatment or test, the agency can issue an emergency use authorization or EUA to make it available.”
Over the years FDA has issued EUAs for anthrax, ebola, enterovirus, H7N9 influenza and Middle East respiratory syndrome.
https://publichealth.jhu.edu/2020/what-is-emergency-use-authorization