Restricted 9-3 for sure. But restricted from blocking back toward original position of ball per paragraph 3? I don't think that's as clear. I know some conferences are ruling the play in the OP as legal and others as illegal. I don't care one way or the other as long as it's clarified. Coaches are going to coach the play in the OP as legal until they are specifically told it's not. Every mention in "official" ARs and videos allude to the fact that becoming restricted by leaving the TB is in reference to not blocking 9 to 3. Is there any official CFO document or AR that specifically states that the OP is illegal?
What in paragraph 3 do you find confusing? Para 3 says:
"Players not covered in paragraph 1 (above) may not block below the waist toward the original position of the ball at the snap until the ball carrier is clearly beyond the neutral zone."
It reads players restricted at the snap may not crack back.
Regarding the OP, the player is unrestricted at the snap so he's allowed to crack back. Since he's left the tackle box, he can only block 10-2, but still may block towards the original position of the ball.
Seems clear and unambiguous to me.