Israel doesn't need nuke subs, since its enemies are all quite close. And the Mediterranean sea is not as large as the Indian Ocean.
Is this website and author reliable? There are several inaccuracies and errors. For one thing, the three follow on talwars all have brahmos. Also, the article states that the "Brahmos naval variant" could not be developed on time. But in fact, Brahmos BEGAN as a naval anti-ship missile, and it was the navy that first inducted it. The land attack and air launched variants came later, those were the "variants", not the naval version, which was the original one.
But India going for another three Talwars, based on the Krivak-IV was reported last year too. Excellent decision IMO. Provides a nice force structure to the navy.