Edit: https://youtu.be/ovYbgbrQ-v8?si=HS7f9aBq9x3MUfFs&t=1325
It's not that Swift itself failed, but that Lattner thinks Swift has become too complex too fast, due to the pressure of a rapidly growing user base.
Specifically, he addresses his main focus for Swift providing "progressive complexity"; that failed.
(Note: to find this I searched the timestamped transcript for "failed".)
But, he did not say "Swift massively failed"
He said something like the effort to incorporate progressive disclosure complexity (i.e. making the language easy for beginners and introduce them to more powerful features as they use the language) in Swift, massively failed.
It's a clickbait title.
He said it was (at least) one of the main goals:
"Swift, the original goal ..." and then he trails off into a tangent and returns a bit later.
[23:13] "so that was that was a big a big focus of my work on Swift and a big focus of the other language uh massively failed in my opinion by the way so massive Lessons Learned Swift has turned into a gigantic super complicated bag of special cases special syntax special"
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