Liu Xiangrong and the others flushed. In terms of character and knowledge only, they had a huge opinion of Ou Yangming indeed.
Nonetheless, when Ou Yangming retrieved the concentrated immortal liquid and did not stint on using it on the Interspatial Spiritual Tree, they changed their perspective of him. Regardless of how the young fellow acted before this, as long as he used a treasure that benefitted the spiritual tree, everyone acknowledged his ability.
Perhaps Ou Yangming did not have the experience nor skill to save the Interspatial Spiritual Tree, but if he possessed an unlimited amount of the concentrated immortal liquid and used it regardless of its cost, he might be able to create a miracle and save the tree.