Hi, have you tried the 'friends of burngreave' website ? You can email them and they may be able to tell you if there is a headstone or not.
From the 'Indexers' site, I take 'removed from parish' to mean that the person did not die in the parish which they are buried, be it a parish in Sheffield or elsewhere. You can search the term on that site too.
I hope this helps a little. I will send you pm too🙂