I don't think it's anything that sophisticated. I think these are real users who are being incentivised to vote and comment on posts, but who have no real interest in Product Hunt, or in the content they're interacting with.
A lot of the "reviews" are vague to the point of meaninglessness (like "My experience in site is amzing good"), seem confused about what the product is (e.g. one review claiming that "this is great project for YouTube users"), or parrot what are obviously marketing talking points (like "you are not paying $0.50 to $1.00 per user or 5% fee, while you build out a beautiful OTT platform").
Another big hint are the reviews:
https://www.producthunt.com/posts/teyuto-2/reviews
A lot of the "reviews" are vague to the point of meaninglessness (like "My experience in site is amzing good"), seem confused about what the product is (e.g. one review claiming that "this is great project for YouTube users"), or parrot what are obviously marketing talking points (like "you are not paying $0.50 to $1.00 per user or 5% fee, while you build out a beautiful OTT platform").