That's correct: here's the passage in question from the Google Objective-C style guide:

> dealloc should process instance variables in the same order the @interface declares them, so it is easier for a reviewer to verify.

One engineers idea of 'logical order' may not be another's, so alphabetical order seems as good a sorting method as any. And since the article itself doesn't link to the style guide, here it is:

http://google-styleguide.googlecode.com/svn/trunk/objcguide....

Google keep it regularly updated, so it includes newer developments like ARC and the modern literal syntax.