Guys I'm sorry but watch the video of trump again when he says that to bibi.
My interpretation is Bibi in private beforehand ASKED him to say that. He needs a situation where the US is pressuring him not to build so he can blame it on someone and abdicate responsibility for his behavior.
Taking all the evidence in total including the ridiculous way he said this comment including body language and demeanor, I really don't think Trump gIves a dam if Israel builds.
In general, I think Israel entered the process of dealing with the Trump Administration with more leeway in terms of being less concerned about the United States' reaction than has been the case in a long time. Probably since parts of the Reagan Era. Yet, along the lines of what you said, I think Bibi dropped the ball. He could have easily told Donald Trump that a so called two state solution is no longer viable from his perspective and that there's no realistic path to peace. Instead, Bibi kept the allusion alive that a ' peace agreement' was possible.
Like I mentioned in another thread, I think Donald Trump's ego is a major concern. Trump doesn't take well to failure and that could have consequences if Israel doesn't compromise enough. Not to mention the consequences if Israel compromises. The good news though is I don't think that Trump cares one bit about the ' social justice' component of the equation that the Left is fanatical about.