Probably. Most code collaborations will have people working on different sections of code, be it functions, etc. A program like this would probably break things down via function, and be able to figure out that there are at least two people involved in its making.
some deeper digging (besides that one Quora post) seems to indicate that he is. I don't have links right now because it took me some hours to find them last time, but it should be said that he is definitely the person shown in his public profile pictures, and if his contributions were supplemented by shadow entities it seems likely that the progression of his work and direction it has taken would be more scattered.
Could someone provide a comprehensive description of what on earth is TJ Holowaychuk? I did Google a bit, and I'm still confused. Is it the new __why?
No, he's just ridiculously prolific.
Can they tell us if Satoshi Nakamoto is actually only one person?