They use DecisionDesk to source their projection. Rich Baris has denounced media projections as the be-all, end-all:

https://twitter.com/Peoples_Pundit/status/1324714717173174272

"Media figures are not authorities on race calls. Neither are election pundits. States will handle their certifications.

If media and pundits were authorities, Arizona would certify for Joe Biden. But they are not."

What the fuck