Officially they not launched any block explorer in neucoin.org or forum
But it looks very official to me. Neucon logo, Neucon blue and Neucon distribution.
If the numbers reflect the current blockchain - it's as official as official can be.
Since you participate on the neucoin.org forum, could you ask there for this information:
[...]
Publicly visible addresses and verifiable transactions
Second, all NeuCoin tokens owned by the foundations, as well as all restricted NeuCoins (whether owned by founders, angel investors or service providers) will be held and mined in published addresses clearly visible and verifiable on the NeuCoin blockchain.
[...]
Thank you.