What a load of absolute crap.
How do you know that your uber driver hasn't been drinking? Or that he isn't on prescription medication? Or has hay fever and has just taken a piriton that has caused him to be drowsy? You don't. You trust that that person has made the decision for their job and that they know their body themselves.
For most Muslims this won't be their first fast, they will be used to it and take steps to make it as easy as possible for themselves.