Sorry, but that page does not seem to say what you wrote. E.g. I can’t see how a remote attacker (such as a malign webpage, email, application, …) could take advantage of an unlocked bootloader without being able to see (and modify) all the data on your phone. IOW I think what you write applies only to an attacker who has physically taken your phone (temporarily).

Your links are all broken (because of “…” elision)

Can someone point me at technical info about the risks of having an unlocked bootloader? From where I stand, the risks seem completely irrelevant (to take advantage of an unlocked bootloader, the attacker would need to have full access to your OS already). AFAIK, locking of bootloaders was never designed to protect the user, but only to let cell-phone providers restrict what phone users can do.

The question is: are they going to do something about it?