If this is a legit leak, then the leaker won't stay a developer for very long. At least not an employed one.
Although that would also mean another thing, that should finally put an end to those threads about dev/studio x not knowing anything about NX.
Namely, that devs/studios DO have devkits/prototypes already. ;D
If I understood the post you're quoting correctly, though, they do not believe this is legit. (Also, at this point I'd be astonished if NX dev kits aren't with devs, if any form of the system is coming out this year.)