You're right. This line was left over from previous versions and I forgot to remove it when I updated the plugin's code. Fixed now. Thanks for bringing it to my attention.
I have the visustella core engine installed plus a few others (MessageCore, BattleCore, SaveCore, MainMenuCore) and have not encountered clashes so far. Having said that, I did not conduct dedicated QA checks for this particular subject, so I can't promise that there are no edge cases in which clashes might occure.