OOC: Not in the sense of saying "these repeals were illegal and shouldn't have passed." Such a statement would itself be a Metagaming violation.
For reference, 313 and 411 both claim the resolutions (GAR# 15 and GAR #410, respectively) they repeal are redundant considering the COCR, but the COCR makes no mention of marriage.
Bananaistan alluded to this briefly. I think both sides of the necessity question are true. That is, COCR does protect same-sex marriage in most member states (those repeals did not commit an Honest Mistake); but at the same time the original resolutions were not duplicative or unnecessary.
Imagine a devoutly religious country whose gods forbid non-reproductive sexual contact, that happens to be prone to all sorts of natural disasters, which are attributed to divine wrath. Perhaps their primitive scientists have 'proved' that children of same-sex couples have worse outcomes than those of opposite-sex couples. Such a society finds itself with a "compelling practical purpose" that it can advance by forbidding same-sex marriage. That loophole in CoCR is tough for a modern, honest nation to wriggle through, but it does exist. So while GAR #35 does generally protect it, the protection isn't foolproof and another resolution specifically protecting it wouldn't be duplicative.