Up until this point he could still be referring to hashcash, which would make "we" mean the history of cypherpunks attempting to make decentralized sound money, no? Do you have any later reference to "we"?
Discussion
I don’t think this is about hashcash is because he’s talking in the present tense in the context of bitcoin. If he were talking hash cash he would’ve been talking in the past tense and said “we propose*d* a system…”
But I just skimmed some mailing list messages and didn’t see any other “we” messages. I know I’ve seen more than the one above though.
There's certainly enough evidence to suggest satoshi could be a group, even a multinational group. Its rare even in the followers satoshi spawned for someone to understand every aspect written into bitcoin, its easier to imagine satoshi as a group, maybe having one public facing head that changed over time.
Yeah, sometimes it’s hard for me to imagine that one person could have created something it is so complex, with so many implications, but in such a simple design, but who knows, we’ll probably never know