Translation:Who is this person?
There are situations where you would say this sentence (in English at least). For example, if somebody shows up to your party and is being a loudmouth and saying obnoxious things, you might say, "Who IS this person!" meaning 'who do they think they are' or 'why are they at this party.' It's not a completely useless phrase.
I agree that the mechanized speech sounds like "shito". I decided to enter the same phrase into Google Translate, and that mechanized voice pronounced it as like "hito" as you would expect. Then I entered 人 into Takoboto (a free Android app that is a Japanese/English dictionary -- it's great BTW). When I had Takoboto say "hito" the mechanized voice also sounded like "shito". In both Duolingo and Takoboto, the word 人 sounds too sibilant to just be "hito".