Only vizza and antonplus posted the same verbatim comment. Could just be the same person, different accounts. The accounts were created a long time ago as well. Doesn't look like shilling.
But then vizza posted the same comment as kearneyface (or vice-versa), as evidenced by the second and third screenshots.
Oh wow you're right. How bizarre.
Old accounts with sparse posting histories are just as suspect as throwaways. People batch-create + age accounts to sell or rent to marketers.
Really?? On HN? Who cares? This is a niche site... isn't it? If it's not, my account is 2138 days old, almost six years, how much could I get for it :P ? (I know, about tree fiddy.)