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Are you supposed to relieve the edges on stems?
The manufacturer does that for you, either inherently as part of the forming process or by post-forming finishing operations. The size of the edge break needed to go from dead sharp to safe is pretty small, you can feel that it's blunt but it doesn't need to be big enough to see, R>20μm should be plenty. If in doubt, run your thumbnail lightly over the edge, if it's sharp it will plane a bit off your nail.
gbj_tester
lynx
So I wonder why would that renthal mention that specifically on the bar fitment, especially as you are usually replacing handlebars.
Are you supposed to relieve the edges on stems?