Well I don't know how JLR procure their software, so yes it's possible.Anything is possible. But spoof theories on the web about a massive company like jlr contracting out their software dev and not having knowledge or access to the code? Do you really think jlr is that silly?
I work for a bigger company that has VERY vigorous software testing, even then it's not uncommon for "features" to be found when in use by the customer.
The more complex the system the more features you'll find. Remind me how many ECUs the new defender has....
I'm pretty sure this was a serious point raised by probably most of the people on this forum when it was released.
I haven't bothered reading up on the grenadier since I heard they were moving production to France but I wonder if they'll try and take advantage of this.