The fact that the hacker is requesting 25 bitcoins suggests that they don't have access to Satoshi's Wallet(s). Also, if anyone was watching the addresses, they would see that there was no significant movement in the past 5 months when account was presumed to have been hijacked. So we can put that to rest.
I think we've concluded the those Bitcoins are safe and will remain that way. Satoshi's identity may not however. But this hacker is failing because of poor social skills. 