The internet is not a thing you connect to, what you must actually do is register your intent to disable the bootloader with an adversarially controlled server, and that server must respond with a yes.
Scenarios in which that's not possible are hypothetical (disaster, totalitarian takeover, alien invasion, sudden policy change), and I'm fine calculating that into the risk calculus and deciding that, yep I don't mind driving home and unlocking it the same day I bought it and praying nothing changes in their policy during the drive.
That's basically what I did. We can disagree on this, but it has worked out OK so far.