i believe thats only for tropical reptiles that need high humidity. personaly i wouldnt believe a petstore guy now adays but maybe someone here can aswer your question better
1.0 albino
0.1 black pastel 66% het. albino
1.0 cinny
Plantation Soil is just ExoTerra's version of Eco-Earth (coco husk) so yes you can use it with your BP... how much humidity it releases into your cage will depend on how much water you mix it with.