They frequently pair the word "Unlimited" with a bandwidth related word. For instance: "Unlimited 4G LTE Data"[0].
You actually mean data rate.
All this arguing about the definition of one word whilst another is being casually misused is rather ironic.
1. LTE bandwidth: limited by regulating authorities and the size of bandwidth chunks for which telcos bid
2. LTE data rate: limited by (1) , physics and our current technology
3. LTE data usage: limited by (2) and any contractual terms
40 MHz only with CA I think.