I hate to play the oracle for our Aussie deity, but I believe Pete is carefully distinguishing the stem from the neck, even as he asks the earlier poster what he had meant. (He asks the poster if he meant the "neck" when he said "stem," and then goes on to use the two terms as he, Pete, believes they should be used -- as do I.)
Pete expresses discomfort with drilling the stem, which is the tube that connects the upper and lower braces of the triple tree (as we call it in the U.S.). The neck is the part of the frame that the stem goes through, supported by its bearings. Drilling through that seems less dicey. It would not be hardened.
The poster on the other board did indicate that he used 20 ounces or more of "expensive" marine grease to fill the gap between the neck and stem. This must be quite a mess to deal with if you ever want to take the fork off again. Seems silly to me.