I disagree. The trouble with cluster bombs (as with landmines) is that they are indiscriminate killers. Sure, they may kill some Russian soldiers now, but the ones that don't explode (a huge minority of them) will remain in the ground until an innocent Ukrainian child gets blown up years from now.
It's fine to cheer on the 'killing Russian soldiers' part, but when it comes to cluster bombs that comes hand in hand with 'killing innocent civilians, years after the conflict ends', which is less okay.
Those things being evil does not make cluster bombs less evil.