You have posted the 4th answer that confirmed the app no longer worked. The first answer that came to the same conclusion was posted in 2014.
If you have nothing new to add to an Q/A, please refrain from bumping a Q/A with a new answer. It would have sufficed to upvote an existing answer that said the same.
I haven't checked with Animuson but I assume his reasoning for deleting was: This app is not going to come back to life in the next 6 to 8 weeks. It has lost its value. Deletion is the best option.
I leave it to him to confirm, deny or offer a different reasoning.
FWIW: I've closed so far one or two questions for abandoned apps or scripts with a custom close reason to prevent new answers but leave them as inspiration for creators that are looking for ideas. I'll check with the team first to see if we want to do the same here, meaning the question will be undeleted and closed instead.