For me, the value of a piece of writing has very little to do with who wrote it. Successful people say silly or stupid things all the time, so I try not to get caught up in their echo chambers. Sure, most successful people are smart, but I'd argue most smart people aren't that successful.
As for this essay, a lot of the points resonated with me, so I liked it. I have no clue who Sam Altman is, and I don't think it really matters.