I'd take that as evidence that Hal was not Nakamoto. I didn't know Hal very [1], but I'm pretty sure he was smart enough to realize that if doing something under his real name might have negative consequences, doing it under someone else's real name might bring them negative consequences. I'm also pretty sure he would consider bringing such negative consequences down on someone without their permission unethical and not do it.
[1] He was a senior engineer at APh working on Intellivison and Atari VCS games [2], when I was a fresh out of college junior engineer there. (And he was amazing at it [3]).
[2] http://gdri.smspower.org/wiki/index.php/APh_Technological_Co...
[3] One of the big projects while I was there was the next generation Intellivision. It would have a significantly more powerful graphics processing chip than its predecessor. The prototypes for the new chip implemented via discrete logic on big wire wrapped card in a big card cage. We were all working hard to get some games working on the prototype, which was going to be shown in some closed demos at CES.
This was made difficult for most of us programmers because the hardware guys were still fiddling with the design. We'd work very late until we could not stay awake anymore, and go to sleep for a few hours. Then we'd wake up and head back to work...and many times we would then find a note on our development system that the hardware guys had made a revision, and replaced some of the boards with updated ones.
Those updates would often do things like change the function of control registers, or the number of sprites, or the way color worked. That sent most of us into at least a couple hours of changing our code to work with the new hardware. (This was all hand written assembly).
Not Hal.
Hal would spend just a few minutes, and his code worked again. Oh, and his code was also better performing than the rest of ours, and made better use of memory.