Those post haven't been deleted, just moved to a different username.
You get this pattern whenever an Onlyfans model changes their username.
What appears to happen is that the importer doesn't realize the model has already been imported because of the new username (don't think OF has stable user IDs). It then re-imports all the posts it encounters, but since a post with that ID already exists it updates the associated user.
Result: All the posts it reimported can now be found under the model's new username. All the posts it didn't reimport, e.g. because the model deleted them in the mean time, remain at the old username.
In this specific case the posts are now at
https://coomer.su/onlyfans/user/margot_mngo