Like it says in the client area: it can take up to 72 hours for a new site to be available everywhere. This is due to DNS caching, which is not something we have any control over.
I can see you closed your account within an hour after creating it, so just waiting a bit longer would have fixed this.
This is not a problem.
And in my experience, that DNS lookup tool just randomly fails for some reason. Take their results with a grain of salt.