Only if the frequency of smart sounding text blocks cribbed from elsewhere exceeds a certain threshold, like in the generated example. Humans can also come up

Only if the frequency of smart sounding text blocks cribbed from elsewhere exceeds a certain threshold, like in the generated example. Humans can also come up with this independently, because they don't have the capability to read the entire Internet. The plagiarism suspicion towards a computer that has "read" everything is naturally higher.