Sorry. The entry in the wiki is a bit confusing without this discussion as background.
Please let’s make it more clear that the paragraph is only about cycleways with sidewalk in NL. Default access on cycleway in NL is foot=yes - so the presence of sidewalk=* does not change anything to foot access. Otherwise it would be a bad idea to omit foot=yes on a cycleway. You can not expect that the data consumer is considering the sidewalk tag for access.