question but possible bug about arachne claymore for credits

Hello marathon support, i have currently have arachne unlocked and on rank 5, shouldnt i be able to purchase the claymore mine for credits from just unlocking arachne? there is a upgrade called "deployables" at rank 12 and im pretty sure it unlocks the rest but no idea about the claymore for credits one. Eitherway if it is unlocked by that upgrade, can that "requires arachne unlocked" text be changed to something thats not misleading, like it "requires deployables upgrade"? still gotta ask if this is a bug or just a not clear text.
Thank you for your time and concideration!