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Edit: Also, you cannot post on the other link for some reason?
https://news.ycombinator.com/item?id=26713827
The rest is a dupe-by-value, which is how dupuolity works on HN.
But also: now that the linked page has been updated to reflect that Signal has pushed a newer version of source, it's fresh news again, under its current headline. (If it was, by chance, attention to this 'old news' that prompted Signal's update, that also suggests it was more than a simple 'dupe' in significance.)
There's another active thread today: https://news.ycombinator.com/item?id=26725915