I saw this sentence on newspaper:

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> "The since-deleted tweet suggested that US travellers who were not attractive enough to be bought drinks in bars at home should not expect that to change while overseas..."
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I think the "since-deleted" tweet means that "the tweet has been deleted". What confuses me is that "since" should be bound to a verb "delete" by the dash. I just found "since" can be an adverb, and is this the reason? What if I re-write the phrase as "the tweet has been deleted since"? Is this okay?