What was the pre-fire change to key Moss Landing safety system?

Experts are arguing in the following article about the moss landing battery fire, It is stated that, 'A modification made before the recent Moss Landing battery storage plant fire may have compromised the effectiveness of the plant’s fire safety system. The plant burned for two days in January, ravaging a showpiece of the state’s green energy future. When it opened in 2021, Texas-based Vistra boasted in news releases that the world’s largest plant was a “keystone” to the state’s clean energy efforts.'