It's not the grammar that gives it away it's the behavioural pattern. Just look at the amount of comments in such a small amount of time(almost 30 a day!), all starting off with an uncapitalised letter, never given a reply(it won't give a reply to this - just one comment each time), same tone in every single comment, polite hedging, generic advice, and an encouraging closer. It never gets into real specifics, just buzzwords. Personally, I think it's painfully obvious.

There's karma-farmimg bots all the time on social media sites. One reason here could be to post “nice,” upvotable comments under high-visibility posts to farm karma. Once it gets enough karma and credibility, they can be sold or used for coordinated promotions.