Before his trip to Daluo Temple, Lin Jin did a lot of planning in advance. He had decided that he would conceal his actual identity. Though, in order to force his enemy to treat him seriously and with respect, he had to use some other identity.
This was when Curator's identity came into use.
Not to toot his own horn, but Curator's name had gained some prestige in the underground society. After all, when he dealt with Snake Country from the Grassy Continent, Curator's name had already spread like wildfire among the community of villainous experts.
This was, of course, just one part of the reason for using a false identity. If a fight actually ensued and if grudges were created, it would be ideal for Lin Jin to use his real identity.
The opponent could easily track him down after this.
That would place the Jade Dragon Kingdom and Maple City in harm's way.