No, it is the ideal IED. It means it will kill in a large area plus the area will be contaminated. The main problem with one of these is that EOD teams can not blow them in place and probably can not use a robot on them due to the chance of dispercing the chemical agent.
Even during WWI, chemical land mines were used. They are very, very effective.
And to this day French Farmers are still encountering live Chem Devices in thier fields that are just as potent as they day they were embedded in the ground by the war.