Did Chesa Boudin set the $950 threshold for theft?
No. Proposition 47 has nothing to do with DA Boudin. California passed Proposition 47 seven years ago to set the felony theft threshold at $950, which is still among the lowest in the country ( 38 states have felony thresholds at or above $1,000 and Texas has a threshold of $2,500). It did not decriminalize theft–it is still a crime to steal less than $950, it is just a misdemeanor rather than a felony. The DA does prosecute misdemeanors, and recently took a misdemeanor theft case to trial.
Blaming Prop 47 for property crime is silly: following the implementation of Prop 47, California saw a decline in property crimes.