Twitter themselves had a guide that explained why NPR and BBC were not labelled as such, which has been revised since, but is still archived.
"State-financed media organizations with editorial independence, like the BBC in the UK or NPR in the US for example, are not defined as state-affiliated media for the purposes of this policy."
"State-financed media organizations with editorial independence, like the BBC in the UK or NPR in the US for example, are not defined as state-affiliated media for the purposes of this policy."
https://web.archive.org/web/20230404115255/https:/help.twitt...