That's already been ruled. It doesn't need errata. It's inability to receive knockback nullifies that aspect of Combat Reflexes. Hopefully, it reduces the cost of the power slightly as well.

EDIT- d'oh. read sidestep, facepalm.

This is incorrect.

From the player's guide:

now that's pretty nifty.

Wow, I could have sworn I read otherwise here recently. Do I have to commit harikari or just lose one of my precious Hair10 cookies?

You probably did read that. IIRC, I said something to that effect very recently. I was checking something else in the PG and saw that entry again. At the time I recall thinking "Hmm...I think I just recently said the opposite of this." I meant to go find that post and correct it, but I forgot.

Hair10 gives out cookies now? I should, uhm, give him rep more often or something.

He gave out cookies back when he was RA to people who correctly answered questions on the rules forum and saved him the trouble.

so DONT CLEAR YOUR COOKIES! not only will you have to log in again, but you lose his, too!