For anyone actually interested (i.e., not any of the liberal posters on this site),
here's the document.
It's really just a summary of what strategies schools/IHLs have been considering so far, while reiterating existing CDC guidance for educational institutions from May.
In the context of the document, the phrase "highest risk" (which only occurs once in reference to K12 schools, on page 2, and once again for IHLs on page 7) is used only to compare full reopening to virtual or hybrid learning. Full reopening is only the "highest risk" relative to alternative strategies; the CDC does not call it "high risk" in a vacuum.
And people wonder why conservative have a problem with the fake news media? NYTimes took a single document, extracted two words out of context, and then built a narrative that President Trump and Republicans are culpable for child deaths that haven't happened yet.