There is a non-paywalled story here. https://abcnews.go.com/Politics/fully-vaccinated-americans-r... Neither the NYT nor ABC stories have links to the actual guidance, and I don't see anything about this on cdc.gov. I guess this was embargoed and the story was released before cdc got around to publishing the guidance. Update: Guidance is now at https://www.cdc.gov/coronavirus/2019-ncov/vaccines/fully-vac...
This is a media blitz, and one may wonder why there are prepared, published stories about CDC guidance that hadn't yet even been published.
I'm sure there are many rational reasons for this. One, indeed, is particularly salient.