No, this is not an error.
Here are a few of the FAQ and answers from the search engine creator -
1.1 Why is this backwards?
It's a Google mirror. A common practice for busy websites is to create a mirror site, which is an exact replica of the original site but on a different server. This way if one server is really busy, you can go to the other server. elgooG is a play on this idea, except instead of an exact replica of the site, it's a mirror image of the site.
1.2. Why have you done this?
1.3. Well, yes - but what's the point? Other than humor.
It helps promotes reading backwards, which could be useful in such situations as reading the front of an ambulance or playing scrabble.For more FAQ and answers click here - Google Mirror FAQ
Nuf, nuf, nuf. yalp evol I.