I think this is wise advice. The situation is extremely volatile.
In fact, if you have travel plans to any other major American city on the West Coast, I’d hold off on that if you can, at least until we see how this develops. If you must travel then obviously try to stay in wealthy areas, especially in LA.
I would avoid travel, if possible, to any so-called “sanctuary city” (like LA) for the time being, anywhere in the US.
The situation is very similar to the George Floyd riots in 2020 in that the violence is downplayed but very real. Because sanctuary cities purposely fly in the face of Federal immigration law, these cities are vulnerable at the moment.