The point is Microsoft caused this and is either unable to correct it or can't be bothered. Users of an OS shouldn't need to spend hours [days] solving problems caused by something clearly created in error. And talking about just one folder as if this is a one off proble fails to answer tha fact that ALL fol,ders are so marked read only on a SSD, folders created on that can't be emptied as Readonly applies to files within,and folder can't be deleted as it has files in it.
The point is that you have a legitimate issue that's preventing deletion of one or more folders, but you're looking in the wrong place for the cause. I have already explained in great detail that the item labelled "Read-only (Only applies to files in folder)" has nothing to do with why you cannot delete a folder.
See for yourself....
Start by making a test a folder that is NOT within control of OneDrive (e.g. C:\Test) and copy some files into it. Now, use the "Read-only (Only applies to files in folder)" checkbox to make all files within the folder read-only. Then drag the folder to the trash and empty the trash. The folder will be gone. Explorer does not care if one or more files within a folder have been marked read-only. That's NOT the cause of the problem you're encountering.