There are basically two kinds of negotiators. One type identifies a reasonable position up front and sticks to it, with minor modifications, throughout the discussions; the other takes a maximum position up front, yells and screams a lot, repeatedly threatens to walk away from the negotiations, and only caves, as necessary, at the last minute.
Trump, who views negotiations as a way of proving his manhood, is clearly in the latter category. It is in that light that you should view his overtures to Taiwan. This approach can work, but it also results in crises that can easily spin out of control. It also fails if the other party identifies it as a standard negotiating tactic and disregards it (think North Korea).
We’re about to enter into a dangerous era with the Chinese. If you like drama, you won’t be disappointed.