"For unlimited smartphone LTE data plan, full available speeds apply to 6 GB of hotspot data per payment cycle, then speeds slowed for remainder of payment cycle."
For example, StraightTalk gives 5GB at 4G speed, however will slow you to 56Kbps (yes, dial-up speed) after.
That's for the hotspot. You get unlimited LTE on your phone for that price.
gst was talking about a mobile plan offering unlimited tethering/hotspot access. You're comparing that to a much more expensive plan with unlimited on-device LTE but limited hotspot access (8GB on Boost).