How state-affiliated media accounts are defined on Twitter.

State-affiliated media is defined as outlets where the state exercises control over editorial content through financial resources, direct or indirect political pressures, and/or control over production and distribution. Accounts belonging to state-affiliated media entities, their editors-in-chief, and/or their prominent staff may be labeled. We will also add labels to posts that share links to state-affiliated media websites.

-https://help.twitter.com/en/rules-and-policies/government-media-labels

By this definition - twitters own definition - NPR is NOT state-affiliated as far as I can tell.