By looking at the ways touched by this commit it seams like the user made some edits in Colombia, then made some edits on Brock Island without committing between doing changes to the two areas. I doubt that they have local knowledge in Brock Island due to the fact that they added a lake ( https://www.openstreetmap.org/way/1231443750 ) called lago grandis which seems to be in Spanish which while possible I doubt that a lake in Canada would have a Spanish name. Also because of the aforementioned ways name it seems they may have just called it big lake which I also doubt is the actual name. This is just speculation so take this with a grain of salt, someone with local knowledge of Brock island should check that if at all possible. 