Wei Shengxin's words were lofty and grand, but Su Changkong felt like laughing. Wei Shengxin himself never really considered sects like the Profound Darkness Sect as equivalents, treating them as his own only now when it served his purpose, otherwise, he would have stepped forward much earlier.
It was only because he wanted Su Changkong's Transforming Dragon Gate that he brought up the Profound Darkness Sect and others as reasons, talking about resolving enmities.
If he really wanted to resolve hostility, he should have stepped in when Su Changkong faced the encirclement of Mo Junling and four others. Seeing Mo Junling and the others unable to take down Su Changkong, only then did he show a compassionate façade, wanting Su Changkong to hand over the Transforming Dragon Gate to dissolve the feud, which Su Changkong found quite disgusting.