This isn't true at all. Since prop 47, property crime has exploded across the state. Even violent crime rates are significantly higher in LA than they were in 2010.[2][3] In particular gang-on-gang violence may be moving the homicide rate lower, but predator-on-prey violence has shot up. Rapes have more than doubled in the past decade.
> From Seattle to Los Angeles, a “shoplifting boom” is hitting major retailers, which deal with thousands of thefts, drug overdoses, and assaults each year. Since 2010, thefts increased by 22 percent in Portland, 50 percent in San Francisco, and 61 percent in Los Angeles
[1] https://www.city-journal.org/west-coast-shoplifting-boom [2] http://www.laalmanac.com/crime/cr02.php [3] https://abc7.com/murder-los-angeles-crime-covid/7185695/