Those stories are from 2013 and later investigation found them to be false claims.
https://www.nbcnews.com/news/world/nsa-program-stopped-no-te...
https://www.nbcnews.com/news/world/nsa-program-stopped-no-te...
A panel member claimed the phone metadata collection program hadn’t saved any lives/foiled any attacks - not that the NSA itself hasn’t.
Additionally they present this as being at odds with the Obama administrations documentation, not a refutation (they didn’t find them to be false claims).
Lol the article you list was published before the documentation cited was presented (and before my articles were even published) - additionally you are moving the goalposts - the op claim is that the nsa hasn’t foiled any terror plots - not about metadata collection