Not saying you're wrong but the goal of advertising is not necessarily a direct, short term effect of increase in sales. It could be brand recognition, which can be activated via subliminal messaging. E.g. "I heard of you before but I don't quite remember where". I'd also say that's good. If a customer found a product from a review site, that means the customer is an informed subject who is convinced they're buying the right product. Discussion fora is more of a toss up as quality and premises of discussion can be anything really.

Re: article. The screencast (that's how that's called, right?) shows 'this visitor scrolls different' and claims that is how a mobile user scrolls. But that is also how a trackpad (laptop) user who skims through the content scrolls. Basically, its how one 'scans'. Scanning is useful to determine if content is interesting.

Anyway. Its also possible we are talking bots here. Is this possibly the effect of Ad Nauseam [1]?

[1] https://adnauseam.io