I don't think its right to start trying to turn the fanbase against your newly acquired star player before he's even played a game. I think these tweets make sense if Lindor was a free agent, but he isn't.
The correct course of action would have been to say "we made a strong offer and we hope he accepts". If he doesn't, then nobody is really mad because you still have him for a year and you still have a chance to sign him in the offseason, and that's when you can start talking numbers on twitter.