As crazy as it sounds, I think you're right and it's just the developer(s) quitting (rage-quitting?) the project. Nothing else makes sense.

The Bitlocker thing seems strange until you realize that it probably really IS the best alternative for most users. The users who are paranoid enough to not trust Bitlocker can probably look out for their own security, so it makes sense to give instructions for the rest.

None of the explanations people have came up with regarding intelligence agencies and conspiracies really hold water. If the devs were compromised, I doubt they would be given the freedom to post something like they did today. If they were under some kind of NSL or gag order, this would almost certainly violate it.