I don’t think it is trapped Mindflayer as as I understand he is stuck under the rubble since crash (as if he didn’t in thrall fisherman, walk for a bit and then get crushed).
I was thinking that the mind flayer might have made the fishers think there was a beautiful woman to try to tempt them towards where it was buried, but it was all an illusion, rather than that the mind flayer was walking around!
EDIT: I’ve just got to this bit in my new playthrough and I’m increasingly convinced that Gray Ghost is onto something with the theory the mindflayer is responsible for the “beautiful woman”! The “mangled fisher” by the jetty says, when you ask why he didn’t notice the brains “Woman … beautiful … couldn’t look away” and when you ask where she went says “Went west … others followed .. couldn’t help ‘emselves”. The crashed ship is directly west of his position, and the “others” could be the fishers we used to find digging out the mind flayer. Then if you ask if there were more survivors, he’ll say “Elf … ran north … up the beach”. That seems to direct you to the temple doors and my theory is that this elf is Shadowheart, and Larian just haven’t got round yet to putting in different dialogue for the situation in which you rescue her on the ship, in which case she isn’t found by those doors.
