As stated I'm the patch notes:
[quote]The Lament Exotic Sword has been special-cased so its charge rate and delay are unaffected, but it still benefits from the increased guard damage reduction and duration. [/quote]
https://www.bungie.net/7/en/News/article/season-witch-update-7-2-0-1
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Oh, ty! Missed it with all the other patch notes.