It’s not full canon, only legends. It is from a reference book written by Ben Burtt in 2001. But the first half is written as an in-universe book, so I consider it partly canon. (For reference, he is one of greatest sound designers of all time. He made the lightsaber sounds, Darth Vader’s breathing, etc. In addition he also worked on Indiana Jones, made the “voice” for E.T., WALL-E, R2-D2, etc. He’s the guy who popularized the Wilhelm scream easter egg)
https://starwars.fandom.com/wiki/Cult_of_the_Power_Droids
It’s not full canon, only legends. It is from a reference book written by Ben Burtt in 2001. But the first half is written as an in-universe book, so I consider it partly canon. (For reference, he is one of greatest sound designers of all time. He made the lightsaber sounds, Darth Vader’s breathing, etc. In addition he also worked on Indiana Jones, made the “voice” for E.T., WALL-E, R2-D2, etc. He’s the guy who popularized the Wilhelm scream easter egg)