Yup, looks like that's what they are. Haven't tested 0x7E6 and up but below that are definitely trainer flags.
Is it ok if I ask you about something else too? About the map "types" which you can see in A-map (things like village, city, route, underground, underwater, etc.) I noticed when using the underwater type, it seems to disable surfing. Do you have information on what the types do, or anything on how to edit them?