It seems like you are reading into it too much, the account only ever shilled for one company, not that it makes it okay, but that makes it more likely a personal affiliation rather than an admin for hire.
...in trade performing a service. I might disagree with you on what 'for hire' means.
The article I linked claimed, that indeed quite a few persons in rural india believed wikipedia. Also labour in india is cheap, I doubt he did it himself, but payed someone to do it.
In general, many people do trust wikipedia. And PR companies get payed much more, to get some information inside.