Maybe that is the problem.
Maybe that is the problem.
Why are you so surprised he might have multiple accounts? You really have one email account? How about work-related email? Company-facing related email? If anything, its actually good he has multiple accounts and stuff related to / from his company account he is posting from company, and private is private.
No, I have 5, but I only have one HN account. Why would I need more?
I was thinking more that he might have been identified as being the same person posting from multiple accounts, and activating some kind of spam/abuse protection.
For same reason you have multiple email addresses no?
Others might but I can't think why off the top of my head. The only time I've seen an obvious alternate account is the throw-away accounts opened just to troll/spam the site.