I didn't found any evidence for the hollow stud one. Besides all Lego instructions show the solid stud version. I check several diffent years, like 80s,90s and 2000s....
Another thing: can the four small holes be made, too? I know the have no real use (at leat I know none), but for details sake....
Another thing: can the four small holes be made, too? I know the have no real use (at leat I know none), but for details sake....