The option is there. It just says unavailable
A pity, but that's what I suspected would happen. I guess that whoever made the Reddit post in the other thread either got incredibly lucky with a bug or forgot that they'd pre-ordered BFV.
The other potential but possibly unfeasible option is to try finding someone selling an old pre-order code online. Of course, that is pretty risky as there are a lot of scams out there, so if you do go down this route, tread extremely carefully.
I haven’t found anyone selling a pre order code anywhere. If you find one do tell me
