Thanks for the mailing list link. There has been some discussion about using Critic Markup over in the Reviewing Markups topic on this forum. Using the Critic Markup syntax {-- for deletion seems sensible. Perhaps ~~ could still be used in non-review contexts. For example, text that is no longer accurate or relevant, but is not intended to be deleted from the document. This is what the <s> element is used for in HTML5, distinct from <del>.
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