It's hard. I'm instinctively inclined to believe this story, but from first principles, why should I trust that Axios has adequately vetted this source? All I know about them is that lots of people in my circles send me their articles, I've never seen or conducted a review of their journalistic practices.
Obviously thinking about it this way would cause me to miss or disbelieve a lot of true stories, but it doesn't seem right to say I should trust every outlet I see widely posted either.
I know what it means and I agree it's probably an exec. The issue is that the premise - "Microsoft Corporation didn't know thing X at point in time Y" - is essentially unverifiable gossip, yet is presented here as fact
It's probably literally an exec on the OpenAI/Microsoft partnership.
The alternative to "a person familiar" is us as readers never get this information at all.