I can't tell if this is a humorist take on the issue or not because its so completely off base. If you were really a knowledgeable LA resident you would realize that the Valley actually pays for most of LA's expenses (which is why the vote to make the Valley a separate city decades ago failed), but also more importantly realize that there is a lot more to LA's traffic situation than just the 405 and 110 chokepoints.
The simple fact of the matter is that LA has a serious housing and urban planning crisis with no real solution. The city has already been investing heavily in public transportation for years now with multiple heavy rail lines been under construction (purple and crenshaw) and some already opened (gold) - but the fact of the matter is that until a public transportation system that can replicate the freeway system - meaning a system that can replicate both the breadth and depth of the system (Think a 'good' Euro rail system spread across a 30-60 mile radius) - LA will always be a congested mess - unless a paradigm shift in transportation occurs (hyperloop, Uber Elevate, etc.)
The simple fact of the matter is that LA has a serious housing and urban planning crisis with no real solution. The city has already been investing heavily in public transportation for years now with multiple heavy rail lines been under construction (purple and crenshaw) and some already opened (gold) - but the fact of the matter is that until a public transportation system that can replicate the freeway system - meaning a system that can replicate both the breadth and depth of the system (Think a 'good' Euro rail system spread across a 30-60 mile radius) - LA will always be a congested mess - unless a paradigm shift in transportation occurs (hyperloop, Uber Elevate, etc.)