This seems to be a flying automatic defibrillator. Whilst the drone may be for real it isn't clear if the defibrillator actually works. The lightest defib made exceeds the likely payload of the drone many times.
In reality these defibs have now come down in price so much that most public buildings already have them. The time to effective use is only five minutes after which success falls off rapidly so deployment to individual homes is questionable.
And in cities most people don't live in houses with convenient landing areas outside