Yeah, I shit on LA rent as much as anyone else, but that article is definitely disingenuous. The 30% rule is a good rule to have, but not absolutely necessary once you reach a certain income. Gas, Food, discretionary income, and emergency funds don't necessarily scale up just because you're buying a 2 bedroom apartment over a bachelor unit. Size of family is a bigger factor than anything else.
I currently pay $625 + utilities for my room in a 2 bedroom apartment in San Gabriel. $1250/mo is definitely below the norm for a 2 bedroom even in SGV, but $3300 is definitely higher than the norm here, too.