To be honest, it would have been better if you didn't delete your AppSpot website. If you still had access to the application ID, you could have configured a 301 redirect to move traffic from your appspot address to your new address, and your new website would have received the search ranking strength of the old appspot address. Any site that did link to your appspot address will now show a dead end, since they don't necessarily know your new address.
As for removing the appspot site, I tried a few searches and it looks like Google has completely removed your appspot site from its index. However Bing still shows your old website as the top search result, and still has some cached web pages:
http://imgur.com/tGh9com
In short: yes it looks like your appspot content was completely removed, but you'll need to wait a while for your new website to gain the same search ranking as before.