That data doesn't show 2021. It only goes up to 2020.
You don't have to try very hard to find data that supports a massive uptick in violent crime in 2021. Dozens of cities have reported all-time-high murder rates. Even cities like Philedelphia, which was already pretty high to begin with.
https://www.theguardian.com/us-news/2021/sep/27/us-murder-ra...
I don't think it is due to defunding the police, however. As has been pointed out, murder rates are up in large cities, and small towns, both Red and Blue.
There is a simple explanation: Nobody is getting incarcerated, because of COVID requirements in jails.
In my hometown, which is not a major metro area, a friend of mine (who lives inside city limits) even had a cow stolen. When discussing this with the police officer, the officer's remark was "crime is up over a thousand percent" because "they can't incarcerate anyone" because of covid. They would book people, but the jails are at max capacity, so they don't even do time. They get "booked and released".
https://www.opb.org/news/article/npr-the-covid-19-crisis-str...