We can agree that Jetbikes are not Bikes in 6th Edition.
We can agree that RAW (from Codex and BRB) Jetbikes are immune to Jaws.
We can agree that the FAQs are poor, and the SW FAQ is out-of-date in this regard
(i.e. It literally doesn't make sense, in 6th, to call Jetbikes a sub-category of Bikes).
But you would still enforce this in a game?