There is not enough information in the linked article to assess this situation. What were the protesters doing? What laws did they break? Why were the cases dismissed?
This country has a lot of legal history where people were guilty as hell but had their cases dismissed for political reasons (e.g., the so-called, "Central Park Five"). I find this interesting enough that I'm going to do a little research.
Here is a capsule summary of the conduct of the "innocent protesters":
"The investigation all stemmed from an incident in Oct. 2020 where Phoenix police officers believed that a group of protestors was trying to block a light-rail train. At the time, police said some of the protestors in the group were carrying weapons like an AR-15, a pistol, a stun gun, a metal club, a brick, a knife, and smoke bombs. Court documents detailed that when the group ignored police commands to clear the street, a police lieutenant at the scene ordered the arrest of 15 protestors."
Oh yeah, they were innocent. "Falsely charged," indeed.