Now we can all play the bloody minded pennant, but I am better at it than most if you want to take me on.
You are saying that "Getting 30V out of a 24V battery is clearly nonsense," without qualifying the statement,
But you see I did qualify the statement, the whole of that quote reads:-
If that circuit actually worked as posted, not the experiment you did, you would get 30V out of a 24V battery which is clearly nonsense.
So the qualification I made was "If that circuit actually worked as posted
Now oddly enough, that actually means the circuit as posted. If you look at this you will see that each of the "regulators" are labeled 7819T and 7519T.
So unless you can come up with an isolated DC / DC converter that will work with out any external components AND
is called 7819T and 7519T then you are wrong as there is no way it can be a boosting converter. Therefore making my statement true.
However if you can supply a link to two boosting regulators that are capable of working in that configuration and that have that as the part numbers or part of the part numbers, then I will post an apology for not being completely accurate.