bbeoj

Nevermind… Anmari answered this question well here: http://ww.wp.xz.cn/support/topic/twenty-ten-continue-reading?replies=4

It stems from an incomplete understanding of what it means to remove a hook from a parent theme – pay attention to these words in the TwentyTen comments:

“We can remove the parent theme’s hook only after it is attached, which means we need to wait until setting up the child theme…”