Isn't it because there's a sufficiently powerful alliance supporting us from the outside?
He'd be foolish to give up his greatest support for the sake of political opinions on Holy Terra. If he really listened to those remarks and cut ties with Gu Hang, standing against the Alliance, those who are earnestly persuading him now would be overjoyed inside, praise him with a few words, and then in a couple of years find an opportunity, or simply create one, to remove him from power.
That is absolutely the case.
To live well, the more criticism from the outside, the more he should assist Gu Hang earnestly. The two are already deeply entwined, and backstabbing Gu Hang cannot bring him any benefit, only ensuring that once he loses his greatest support, he will be settled scores with in the future.
Of course, while tightly clinging to the Alliance's support, he must also be tough enough himself.
