I am not too familiar with Tasker, but the trick of course is figuring out how to get the data from bluz into Tasker. We do have a local communication option that can bypass the cloud, but Tasker would need to be able to read and understand BLE data, not sure if it can do that.
Unless Tasker can already connect to BLE devices and get the data from them, it may be easier to go through the cloud. If Tasker can, for example, listen to triggers from other sources (IFTTT, webhooks, etc) then the cloud may make things simpler. Not sure though, it depends on what Tasker can do and how it can get data into the app.