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Good catch. The slack spec change is probably a result of the change in suspension. It could be that with less suspension travel, less slack is needed to deal with chain geometry changes over that range of travel. Sprocket size change alone would not justify a change in chain slack spec.Comparing the specs on my '20 vs the '21 using both year's owners manual, the chain slack spec has been changed from the 20's 30-40 mm to the 21's 25-35mm.
I 'm guessing this is due to the either the change in sprocket sizes for both the NC and NCX for '21 and/or the lower ground clearance of the '21 or ?