there are crackers that work with templates, so that they reduce the amount of space to search. the trick is to have good templates. for example, in this case, they probably had a template that was 3 digits, 4 lower-case letters, 3 symbols. the idea being that people are more likely to do that than 9#gag0e!0@, for example.

so it's a combination of luck, computing power (they probably have a farm of gpus), and careful selection of templates (probably guided by analysis of known passwords).