My Apple iPod Touch 4th Generation was stolen if the thief signed out of my iCloud account on the device will it go away on the web map on my computer and keep me from locking it remotely?

My Apple iPod Touch 4th Generation was stolen if the thief signed out of my iCloud account on the device will it go away on the web map on my computer and keep me from locking it remotely? I was asking my grandmother who works in apple tech support at at&t but she didnt know. so im hoping somebody will come by and say yes to my question because my iPod touch is still appearing in my iCloud.com account.