I think when people are saying "the whole screen is ads", they mean the _visible_ screen. The person took a screenshot of the first visible screen and it's all ads. You can even see in the tweet that the tippy top of the next result is a non-ad, but all visible results were ads. Even one of the parent comments says "...Then when I scrolled down, there weren't Google ads, but just a bunch of SEO spam", implying that there were non-ads if you scrolled.

So I think there's just a communication breakdown here.