Neither India nor the US (or Russia or China) are signatories to the Convention on Cluster Munitions:
Signatories to the Convention (blue) and States Parties (purple)
There's no irony, India doesn't have to abide by a convention it isn't part of and can associate itself with other non-members and their participating parts, like banks or contractors.
It's more ironic to bash Indian banks for having associations with cluster munitions exposed foreigners while failing to understand India is under no legal obligation to stop those activities.
...
I'll finish with this. Anti-personal cluster munitions are brutal and barbaric and like land mine, represent a long-term threat to civilian populations and I'm in favor of the US joining the abolition of their usage:
But against tank columns or vehicle formations, there are few better options then a system like the CBU-97:
And if they are to be retained, development on building-buster, low collateral damage cluster munitions like the CBU-107 is a quality step:
Unlike traditional munitions which cause hellish damage:
Weapons like the CBU-107 Passive Attack Weapon don't use an explosive, instead relying on kinetic energy to level structures without causing damage to the wider area.
ATK also works on cluster munitions like the CBU/87:
It designed the FZU-39 Proximity Fuse found on said munition.