In order to preserve plausible deniability, the leak will look genuine in all aspects that are easy to simulate. "Someone else did it" is easy to simulate. A better gauge would be to see if anyone is caught and punished. If so, it was probably a real leak.
People have gotten DMCA takedown requests from them over Llama repositories
The crowd gets bored and my DMCA requests flurry out a month later and all evidence disappears, individuals that might notice dont have the crowd to amplify that they noticed.
You can call that “tacit consent” if you want. But streisand removes all leverage.
Although I don't know how FB rolls internally, it seems more likely than not to me, that it was ack'd by someone higher up in the organization than line engineers or managers. Someone with a permission of speaking publicly for a given area of a company - doesn't need to be CEO, more like a VP/Director maybe.
https://twitter.com/ylecun/status/1643945742850031616
https://twitter.com/ylecun/status/1644503237699969026
pretty clear the non-release and extremely half assed response to the leak is just CYA