The inflection is wrong. The tone goes up at the end, which skins like a question instead of an exclamation.
Yeah, the TTS voice has a lot of faults. Nothing can really be done about it.
Why not record something better?
this is how all duolingo works.
Is that supposed to be ironic?
It can. It can also be serious. Who knows, there's no context :)
Oczywiście! Mamy DuoLingo!