Such sleeper accounts, slowly acquiring clout and time on the platform are often used by botnets. One day they (or their actions) will be sold to the highest bidder to upvote a comment, support an idea, ideology, politician or party or some virtual product, stock or coin.
Possible and that is definitely a thing, but I personally I would not rule out, that there still can be a human behind it, just with that specific style and careful about his privacy.