Do you have a video of Chinese CIWS Type-730 while in testing phase ?? Any video of testing the new CIWS in the shape of FL-2000/3000 system, but still both systems are currently online and installed on the newer chinese frigates / ships. I can quote similarly many Chinese weapon systems which are in service or available for export which have no videos available while in testing phase.
If the Chinese are showing it in defence shows and saying its available for export, then it means they have tested it enough to have confidence to make it available for export.
And also the capabilities of lot of Chinese weapon systems are unknown, its not just the SY-400. Even Jane has added the item to its list.
SY-400 (China) - Jane's Strategic Weapon Systems
So ?? Atleast we will not be overrun or major part of Pakistan would be in Indian hands, better to have a nukes country side then to see it in enemy hands.
And if India launches a nuke strike in retaliation to pakistan doing a nuke strike on invading forces on its own country, then their bad, as we used nukes against an invading force on our own land and not on Indian land, for that India does a nuke strike, then i believe MAD will come into effect and both countries will get ruined.