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They Found The iPhone Backdoor
(odysee.com)
This is a most excellent place for technology news and articles.
The video doesn't go into the technical details about TriangleDB; that is left as a reference to the securelist article. Instead, the video discusses the background of the exploit, what has been done by others, what has been done since, and calls out some curiosities about the perpetrators.
I found the video to be a great summary and quite insightful.