It's not as simple as they claimed; their true intent was to disrupt Li Zhirui's tribulation transcendence.
But now that the moment has arrived, observing the changes in the situation, the Head of the Qingzhu Sect dared not continue to take risks. He could see that the ninth tribulation thunder had already fallen, leaving only the final Heart Demon Tribulation!
If they were to turn against the Li family now and wait for that man to overcome the Heart Demon and break through to the Mahayana stage—even though he would only just have stepped into Mahayana and might not yet be familiar with his own power—they still wouldn't stand a chance against him.
Although Integration, Mahayana, and Tribulation Transcendence may not differ fundamentally in nature, there are considerable disparities in the amount and quality of mana.
Furthermore, with the likes of Lianxu cultivators such as Li Chengshuo, by then, their party would likely face an inescapable calamity!