If it is anywhere near as good as Tomahawk then it will be a valuable asset. There is a reason US military prefers them over cruise ones.
Pakis may be pissing in their pants after this news. With Bigger payload Pindi & Islamabad is toast.
There is a lot of misinformation also that the government gives in order to check the box of 'public information'. I'd say that some of the 'testing and failing' is more of a cover-up designed by the GOI to keep the eyes of Anglo-Saxons away from our defence. The USA always tries to dig information on a lot of China's defence projects because the CCP remains absolutely mum about its military developments.
However, by giving 'some' news, our folks may try to deflect the attention of the global community.
The good thing about Nirbhay is that if deployed from Ladakh or Sikkim, it can easily target PLAAF bases and rocket artillery regiments deep inside East Turkestan and Tibet. What's worse, if the same missiles are deployed in Arunachal Pradesh, they can hit targets as deep as Chengdu city.
I just did a preliminary check on the distances from Dibang to Chengdu and it comes to somewhere around 981 Km. Chengdu is a critical city that has much of PLAAF's aerospace industry. If the conflict were to hypothetically get very hot, Nirbhays can be used to rain hell on their aerospace factories in Chengdu and flatten the city. Sure this might seem a lot, but basically, this message needs to be sent across the Himalayas.