I'd consider it more like accepting a new job. Your new employer is totally entitled to reorg and transfer you to a new team you wouldn't have wanted to join on week 3. But if they planned on transferring you out of the position all along, while they were simultaneously convincing you to leave your old job for this cool new position that you'll totally get to have (for two weeks), then they're being shitty.
If I found out that my new employer/acquirer was dishonest to get me on board with the terms we ended up on, sure they "won" the negotiation in a way they're entitled to, but it's going to sour the relationship for good reason and I'd say it's bad behavior that makes the ecosystem worse for all of us.
If I found out that my new employer/acquirer was dishonest to get me on board with the terms we ended up on, sure they "won" the negotiation in a way they're entitled to, but it's going to sour the relationship for good reason and I'd say it's bad behavior that makes the ecosystem worse for all of us.