photos are deleted from lr but not original folder even though I indicate I want to remove from disk

Folders are NEVER Deleted when you Delete from Disk the image that are in that folder. This is something you need to do Manually by Right Clickin on the folder in the Folder section of the Library module and Select Remove.

Do you are in a collection when you try to delete photos? If yes then the photo will only removed fron the collection.

Goto the "All Photographs" view and delete photos from there.

https://community.adobe.com/t5/lightroom-classic/how-do-i-permanently-delete-photos-from-lightroom-classic/td-p/9940847?page=1