You are correct the manual does say every two, but apparently the belt composites are much better which I suspect is why later models are 5yrs.
Mine went 4years between changes and the belt looked and flexed like new on removal, but I had only covered 2k in four years as the bike sits in my lounge as art more than being on the road.
I'm comftable with their explained rational and happy to push the life expectancy, but you each need to do what your comfortable with or follow the advice within the owners manual
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Ride it naked!
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