The writer of the article seems to think galvanic corrosion is hurting the bearings.  We used to chromate all of our aluminum parts at work for military and commercial applications.  That is likely similar to the alodine process.  I don't think corrosion would do too much to the bearings myself because the fuel is getting flushed out so quickly and the aluminum is not touching the balls or race.  I was always under the impression that the blue anodising of the motors wouldn't let the heat escape as good as the bare alum. but maybe there was another reason for this. The inside is not done though.