This just refers to to GM bulletin with a some added commentary. When I searched for the use of abrasive discs causing engine damage, the only thing I found was the GM bulletin and articles that referred to and just add more commentary. I could not find real world evidence of engine damage.This is an interesting read.
I’d be very curious to see a real world example of engine damage caused if someone has it. Because I can’t find it.
I’m not sure how much material you could physically remove on purpose when using a White/fine grade bristle disc on aluminum machined surfaces. It would also depend on the metallurgy of the part. However if it’s an engine part made that handles high heat, it’s likely not a soft material. The amount of abrasive dust when used properly is so minimal that I don’t know if it’s able to be feasibly measured.