Except, you know, STL wanted to marry Isis; Thomas kept putting their wedding off. Your naïveté shows in your inability to see the frustration bred from an extended engagement.
I don't even know what the heck you're talking about any more. You seem to be talking in circles. Did or did not Sun-Tzu Liao want her dead, in your approximation?
The way I see it, Sun-Tzu Liao loved Isis, but it was more important to him to be the ultimate servant to the State - the Chancellor. As Chancellor, there was more to gain by Isis death than by living, and he used her as bait in a trap, because it was the best political move. Inside, he probably was upset to be losing her, but he told her point-blank he wanted her to die, because he knew it would make her move on. Great guy, that Sun-Tzu Liao.
Ah, so that confirms that he didn't plan on her dying, he was just stating the obvious; if she died, there'd have been a good chance of FWL involvement in STL's endeavour to punish St. Ives for it.
Quite the opposite. The whole operation was planned by Sun-Tzu down to the finest detail, and her death was expected. The message being relayed in that sentence is "you screwed up my plan by living".